CA2465102A1 - Medical simulation apparatus and method for controlling 3-dimensional image display in the medical simulation apparatus - Google Patents
Medical simulation apparatus and method for controlling 3-dimensional image display in the medical simulation apparatus Download PDFInfo
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- CA2465102A1 CA2465102A1 CA002465102A CA2465102A CA2465102A1 CA 2465102 A1 CA2465102 A1 CA 2465102A1 CA 002465102 A CA002465102 A CA 002465102A CA 2465102 A CA2465102 A CA 2465102A CA 2465102 A1 CA2465102 A1 CA 2465102A1
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- dimensional image
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C11/00—Dental articulators, i.e. for simulating movement of the temporo-mandibular joints; Articulation forms or mouldings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
- A61C1/08—Machine parts specially adapted for dentistry
- A61C1/082—Positioning or guiding, e.g. of drills
- A61C1/084—Positioning or guiding, e.g. of drills of implanting tools
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C9/00—Impression cups, i.e. impression trays; Impression methods
- A61C9/004—Means or methods for taking digitized impressions
- A61C9/0046—Data acquisition means or methods
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1116—Determining posture transitions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1126—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb using a particular sensing technique
- A61B5/1127—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb using a particular sensing technique using markers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
- A61B5/4538—Evaluating a particular part of the muscoloskeletal system or a particular medical condition
- A61B5/4542—Evaluating the mouth, e.g. the jaw
- A61B5/4547—Evaluating teeth
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0004—Computer-assisted sizing or machining of dental prostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/002—Orthodontic computer assisted systems
Abstract
A medical simulation apparatus capable of performing simulation while correlating a 3-dimensional image with an actual model. By the movement of a mandibile dentition model (62), it is possible to obtain coordinates in the coordinate system defined by three reference marks MK1, MK2, MK3 for measurement object marks MP1, MP2, and MP3 on the surface of the mandibile dentition model (62). The coordinates obtained are changed into the coordinates of the coordinate system defined by the reference marks PK1, PK2, PK3 according to the relationship between the reference marks MK1, MK2, MK3 and the reference marks PK1, PK2, PK3. Then, it is possible to obtain the coordinate change before and after the movement of the mandibile dentition model (62) and an area specified in advance in the 3-dimensional image displayed on a display (5) is moved according to the coordinate change obtained.
Description
DESCRIPTION
MEDICAL SIMULATION.APPARATUS AND METHOD FOR
SIMULATION APPARATUS
TECHNICAL FIELD
The present invention relates to a medical simulation apparatus for performing a simulation of a surgical operation, for example, for confirmation of a surgical technique and prediction of a postoperative state, and to a three-dimensional image display controllingmethodforthemedical simulation apparatus.
PRIOR ART
In the medical field, a simulation is often performed with the use of a trace of a radiograph or an entity model (formed of gypsum plaster, a resin or the like). On the basis of the results of the simulation, a surgical technique is confirmed and a postoperative state is predicted. Where a surgical orthodontic operation is performed for treatment of protrusion of an upper j awbone or a lower j awbone ( so-called buck teeth or protruding lower lip) or j aw deformity in dental surgery or plastic surgery, for example, a simulation is performed for confirmation of a surgical technique and prediction
MEDICAL SIMULATION.APPARATUS AND METHOD FOR
SIMULATION APPARATUS
TECHNICAL FIELD
The present invention relates to a medical simulation apparatus for performing a simulation of a surgical operation, for example, for confirmation of a surgical technique and prediction of a postoperative state, and to a three-dimensional image display controllingmethodforthemedical simulation apparatus.
PRIOR ART
In the medical field, a simulation is often performed with the use of a trace of a radiograph or an entity model (formed of gypsum plaster, a resin or the like). On the basis of the results of the simulation, a surgical technique is confirmed and a postoperative state is predicted. Where a surgical orthodontic operation is performed for treatment of protrusion of an upper j awbone or a lower j awbone ( so-called buck teeth or protruding lower lip) or j aw deformity in dental surgery or plastic surgery, for example, a simulation is performed for confirmation of a surgical technique and prediction
2 of a postoperative state.
In the surgical orthodontic operation, occlusion of upper and lower dental arches cannot be ignored for positioning of the upper and lower jawbones. Occlusal surfaces of teeth (molars) have raised cusps and fissures recessed between the cusps. Therefore, an occlusal height (a distance between the upper and lower jawbones) differs between a case where cusps of upper teeth are in contact with cusps of lower teeth and a case where cusps of the upper or lower teeth are in contact with fissures of the lower or upper teeth. Where the occlusion is such that the cusps of the upper or lower teeth are in contact with the fissures of the opposed lower or upper teeth on right and left sides as shown in Fig. 7 (a) , for example, a median line CLu of the upper dental arch is aligned with a median line CLd of the lower dental arch.
However, where the cusps of the upper teeth are in contact with the cusps of the lower teeth ~on the right side and the cusps of the upper or lower teeth are in contact with the fissures of the opposed lower or upper teeth on the left side as shown in Fig. 7 (b) , the occlusal height on the right side is greater than the occlusal height on the left side, so that the median line CLd of the lower dental arch is inclined. Ir~ this case, it is clinically necessary to displace er grind teeth fcr improvement of ' ' CA 02465102 2004-04-23
In the surgical orthodontic operation, occlusion of upper and lower dental arches cannot be ignored for positioning of the upper and lower jawbones. Occlusal surfaces of teeth (molars) have raised cusps and fissures recessed between the cusps. Therefore, an occlusal height (a distance between the upper and lower jawbones) differs between a case where cusps of upper teeth are in contact with cusps of lower teeth and a case where cusps of the upper or lower teeth are in contact with fissures of the lower or upper teeth. Where the occlusion is such that the cusps of the upper or lower teeth are in contact with the fissures of the opposed lower or upper teeth on right and left sides as shown in Fig. 7 (a) , for example, a median line CLu of the upper dental arch is aligned with a median line CLd of the lower dental arch.
However, where the cusps of the upper teeth are in contact with the cusps of the lower teeth ~on the right side and the cusps of the upper or lower teeth are in contact with the fissures of the opposed lower or upper teeth on the left side as shown in Fig. 7 (b) , the occlusal height on the right side is greater than the occlusal height on the left side, so that the median line CLd of the lower dental arch is inclined. Ir~ this case, it is clinically necessary to displace er grind teeth fcr improvement of ' ' CA 02465102 2004-04-23
3 a teeth contact state . In order to confirm postoperative problems and solutions to the problems, various simulations are conventionally performed for a surgical orthodontic operation for displacing a jawbone (particularly, the lower jawbone).
For example, a simulation (paper surgery) is performed with the use of a standard radiograph of a head or a photograph of a face. In the paper surgery which is a simulation for predictive diagnosis on skeletal balance, a change in skeletal morphology after the surgicalorthodonticoperationcan bechecked. However, it is impossible to check a teeth contact state, because the paper surgery provides only two-dimensional information. Therefore, a simulation (model surgery) is also performed with the use of a dental arch model.
The predictive diagnosis on the occlusal state is carried out on the basis of the model surgery.
However, it is difficult to reflect and correlate the two-dimensional image information obtained through the paper surgery and the three-dimensional image information obtained through the model surgery with respect to each other. Therefore, a facial appearance change attributable to the teeth contact state cannot be predicted by the combination of the paper surgery and the model surgery.
For example, a simulation (paper surgery) is performed with the use of a standard radiograph of a head or a photograph of a face. In the paper surgery which is a simulation for predictive diagnosis on skeletal balance, a change in skeletal morphology after the surgicalorthodonticoperationcan bechecked. However, it is impossible to check a teeth contact state, because the paper surgery provides only two-dimensional information. Therefore, a simulation (model surgery) is also performed with the use of a dental arch model.
The predictive diagnosis on the occlusal state is carried out on the basis of the model surgery.
However, it is difficult to reflect and correlate the two-dimensional image information obtained through the paper surgery and the three-dimensional image information obtained through the model surgery with respect to each other. Therefore, a facial appearance change attributable to the teeth contact state cannot be predicted by the combination of the paper surgery and the model surgery.
4 In recent years, an apparatus has been developed, which is capable of stereographically reconstructing multiple tomographic data obtained by a tomographic apparatus such as a CT apparatus or an MRI apparatus on a computer, displaying the resulting three-dimensional image (stereographic image) on a display, and performing a simulation with the use of the three-dimensional image on the display. The existing apparatus is capable of cutting away a desired portion of the three-dimensional image and three-dimensionally displacing the cut-away portion on the display. However, it is difficult to cut away an image portion of the lower j awbone and displace the cut-away image portion to ensure proper contact between the upper and lower dental arches without any overlap. This makes it impossible to check the teeth contact state on the display, and to check the facial appearance change attributable to the teeth contact state.
DISCLOSURE OF THE INVENTION
In view of the foregoing, it is an object of the present invention to provide a medical simulation apparatus which is capable of performing a simulation by correlating a three-dimensional image with an entity model.
It is another object cf the present invention to provide a three-dimensional image display controlling method for a medical simulation apparatus which is capable of performing a simulation by correlating a three-dimensional image with an entity model.
DISCLOSURE OF THE INVENTION
In view of the foregoing, it is an object of the present invention to provide a medical simulation apparatus which is capable of performing a simulation by correlating a three-dimensional image with an entity model.
It is another object cf the present invention to provide a three-dimensional image display controlling method for a medical simulation apparatus which is capable of performing a simulation by correlating a three-dimensional image with an entity model.
5 According to an inventive aspect as set forth in claim 1 to achieve the aforesaid obj ects, there is provided a medical simulation apparatus, which comprises: image display means (5) which displays a three-dimensional image of a patient; and display controlling means which correlates an entity model (6, 8, 9, 10) of the patient with the three-dimensional image by utilizing at least three reference points (MKl, MK2, MK3) on the entity model and at least three reference points (PK1, PK2, PK3) on the three-dimensional image, and changes the three-dimensional image according to a change in the entity model.
According to an inventive aspect as set forth in claim 2, the medical simulation apparatus of claim 1 is characterized in that: the change in the entity model includesdisplacingapredetermined portionof theentity model; and the display controlling means determines changes in coordinates of points on the three-dimensional image corresponding to at least three points (MP1, MP2, MP3 ) on the predetermined portion after the displ acement of the predeterminedporti on on the basis of a relationship i
According to an inventive aspect as set forth in claim 2, the medical simulation apparatus of claim 1 is characterized in that: the change in the entity model includesdisplacingapredetermined portionof theentity model; and the display controlling means determines changes in coordinates of points on the three-dimensional image corresponding to at least three points (MP1, MP2, MP3 ) on the predetermined portion after the displ acement of the predeterminedporti on on the basis of a relationship i
6 between the reference points on the entity model and the reference points on the three-dimensional image, and displaces a region of the three-dimensional image corresponding to the predetermined portion on the basis of the determined coordinate changes.
According to an inventive aspect as set forth in claim 3, the medical simulation apparatus of claim 2 is characterized in that the entity model comprises upper and lower dental arch models, and the predetermined portion is the upper dental arch model or the lower dental arch model.
It is noted that the parenthesized alphanumeric characters denote corresponding components in the followingembodiments, andthis definition isapplicable to the following description.
According to the present invention, the three-dimensional image displayed on the image display means can be changed according to the change in the entity model.
According to the inventive aspect of claim 2, when the predetermined portion of the entity model is displaced, the corresponding region of the three-dimensional image of the patient displayed on the image display means is correspondingly displaced. With the use of the medical simulation apparatus, the upper dental arch model and
According to an inventive aspect as set forth in claim 3, the medical simulation apparatus of claim 2 is characterized in that the entity model comprises upper and lower dental arch models, and the predetermined portion is the upper dental arch model or the lower dental arch model.
It is noted that the parenthesized alphanumeric characters denote corresponding components in the followingembodiments, andthis definition isapplicable to the following description.
According to the present invention, the three-dimensional image displayed on the image display means can be changed according to the change in the entity model.
According to the inventive aspect of claim 2, when the predetermined portion of the entity model is displaced, the corresponding region of the three-dimensional image of the patient displayed on the image display means is correspondingly displaced. With the use of the medical simulation apparatus, the upper dental arch model and
7 the lower dental arch model, for example, are produced, and the lower dental arch model is displaced with respect to the upper dental arch model so that the contact state of the upper dental arch and the lower dental arch is optimized. Thus, functional information such as the contact state of the upper dental arch and the lower dental arch can be reflected on the change in the three-dimensional image of the patient. On the basis of the change in the three-dimensional image, a dentist can determine where a lower j awbone to be displaced by a surgical orthodontic operation is to be fixed, which tooth is to be displaced and how the tooth is to be displaced through postoperative orthodontics, in order to achieve an optimum occlusal state and an optimum morphological change of the entire head. In this case, the entity model comprises the upper and lower dental arch models, and the predetermined portion of the entity model corresponds to the lower dental arch model.
As set forth in claim 4, the enti ty model may be a model formed of gypsum plaster or a resin material on the basis of the entity of the patient. In this case, the predetermined portion corresponds to a portion of the entity of the patient to be displaced by the surgical operation.
According to arl inventive aspect as set forth in
As set forth in claim 4, the enti ty model may be a model formed of gypsum plaster or a resin material on the basis of the entity of the patient. In this case, the predetermined portion corresponds to a portion of the entity of the patient to be displaced by the surgical operation.
According to arl inventive aspect as set forth in
8 claim 5, the medical simulation apparatus of any of claims 1 to 4 is characterized in that: the change in the entity model includes providing a dot or a line on the entity model; and the display controlling means determines coordinates of a point or points on the three-dimensional image corresponding to the dot or points on the line provided on the entity model on the basis of the relationship between the reference points on the entity model and the reference points on the three-dimensional image, and displays an image of the dot or the line provided on the entity model in the three-dimensional image on ' the basis of the determined point coordinates.
According to the present invention, the dot or the line provided on the entity model can be displayed in the three-dimensional image with fidelity.
If addition of a foreign component such as a dental implant to the entity model is regarded as the provision of the line on the entity model, for example, a simulation of the implantation of the dental implant can be performed.
Where a dental implant is to be implanted in a jawbone, it is a conventional practice to perform a simulation (paper surgery) utilizing a standard radiograph of a head or a photograph of a face and a simulation (model surgery) utilizing dental arch models for examination of the implantation direction and depth .,
According to the present invention, the dot or the line provided on the entity model can be displayed in the three-dimensional image with fidelity.
If addition of a foreign component such as a dental implant to the entity model is regarded as the provision of the line on the entity model, for example, a simulation of the implantation of the dental implant can be performed.
Where a dental implant is to be implanted in a jawbone, it is a conventional practice to perform a simulation (paper surgery) utilizing a standard radiograph of a head or a photograph of a face and a simulation (model surgery) utilizing dental arch models for examination of the implantation direction and depth .,
9 of the dental implant. However, it is difficult to reflect and correlate two-dimensional image information obtainedthroughthepapersurgeryandthree-dimensional image information obtained through the model surgery with respect to each other. An attempt has recently been made to examine the implantation direction and depth of the dental implant through a simulation utilizing a three-dimensional image based on multiple tomographic data obtained by a tomographic apparatus such as a CT
apparatus or anMRI apparatus and through the model surgery.
However, even if the simulation of the implantation of the dental implant in the dental arch model is performed on the basis of the implantation direction and depth of the dental implant examined on the three-dimensional image, it is impossible to check if the results of the simulation are consistent with the examination on the three-dimensional image.
According to the present invehtion, on the contrary, the dentist can check if the implantation direction and depth of the dental implant are appropriate, by implanting the dental implant in the entity model and displaying an image of the implanted dental implant in the three-dimensionalimage. Thus, thedentistcan properly determine the implantation direction and depth of the dental implant.
According to an inventive aspect as set forth in claim 6, there is provided a three-dimensional image display controlling method for a medical simulation apparatus, the method comprising: displaying a 5 three-dimensional image of a patient on image display means (5); correlating an entity model with the three-dimensional image by utilizing at least three reference points (MKl, MK2, MK3) on the entity model and at least three reference points (PK1, PK2, PK3) on the
apparatus or anMRI apparatus and through the model surgery.
However, even if the simulation of the implantation of the dental implant in the dental arch model is performed on the basis of the implantation direction and depth of the dental implant examined on the three-dimensional image, it is impossible to check if the results of the simulation are consistent with the examination on the three-dimensional image.
According to the present invehtion, on the contrary, the dentist can check if the implantation direction and depth of the dental implant are appropriate, by implanting the dental implant in the entity model and displaying an image of the implanted dental implant in the three-dimensionalimage. Thus, thedentistcan properly determine the implantation direction and depth of the dental implant.
According to an inventive aspect as set forth in claim 6, there is provided a three-dimensional image display controlling method for a medical simulation apparatus, the method comprising: displaying a 5 three-dimensional image of a patient on image display means (5); correlating an entity model with the three-dimensional image by utilizing at least three reference points (MKl, MK2, MK3) on the entity model and at least three reference points (PK1, PK2, PK3) on the
10 three-dimensional image; and changing the three-dimensional image displayed on the image display means according to a change in the entity model.
This method provides the same effects as described in relation to claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a block diagram illustrating the constructionof amedical simulation apparatus according to one embodiment of the present invention;
Fig. 2 is a flow chart illustrating the flow of a simulation process to be performed when a lower jawbone is to be displaced in a surgical orthodontic operation;
Figs. 3 are diagrams for explaining how to correlate an operation performed on an entity model with a three-dimensional image of a patient;
Figs. 4 are diagrams for explaining another r
This method provides the same effects as described in relation to claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a block diagram illustrating the constructionof amedical simulation apparatus according to one embodiment of the present invention;
Fig. 2 is a flow chart illustrating the flow of a simulation process to be performed when a lower jawbone is to be displaced in a surgical orthodontic operation;
Figs. 3 are diagrams for explaining how to correlate an operation performed on an entity model with a three-dimensional image of a patient;
Figs. 4 are diagrams for explaining another r
11 embodiment of the present invention;
Figs. 5 are diagrams for explaining another simulation;
Figs . 6 are diagrams for explaining further another simulation; and Figs. 7 are diagrams for explaining why a simulation is required for a surgical orthodontic operation.
EMBODIMENTS OF THE INVENTION
Embodiments of the present invention will hereinafter be described in detail with reference to the attached drawings.
Fig. 1 is a block diagram illustrating the constructionof amedicalsimulation apparatus according to one embodiment of the present invention. The medical simulation apparatus is adapted to perform a simulation with the use of a three-dimensional image, for example, for a surgical orthodontic operation in dental surgery or plastic surgery, and includes a unit body 1 incorporating a microprocessor and a hard disk therein.
The unit body 1 is connected to an input device 2 such as a keyboard and a mouse for inputting data and commands, a removable disk reader/writer 4 for writing and reading data with respect to a removable disk 3 such as a DVD (digital video disk) , a display 5 for displaying
Figs. 5 are diagrams for explaining another simulation;
Figs . 6 are diagrams for explaining further another simulation; and Figs. 7 are diagrams for explaining why a simulation is required for a surgical orthodontic operation.
EMBODIMENTS OF THE INVENTION
Embodiments of the present invention will hereinafter be described in detail with reference to the attached drawings.
Fig. 1 is a block diagram illustrating the constructionof amedicalsimulation apparatus according to one embodiment of the present invention. The medical simulation apparatus is adapted to perform a simulation with the use of a three-dimensional image, for example, for a surgical orthodontic operation in dental surgery or plastic surgery, and includes a unit body 1 incorporating a microprocessor and a hard disk therein.
The unit body 1 is connected to an input device 2 such as a keyboard and a mouse for inputting data and commands, a removable disk reader/writer 4 for writing and reading data with respect to a removable disk 3 such as a DVD (digital video disk) , a display 5 for displaying
12 a three-dimensional image, and a three-dimensional measuring instrument 7 for acquiring coordinates of a given point on a surface of an entitymodel 6 in a coordinate system defined by three predetermined points.
Fig. 2 is a flow chart illustrating the flow of aprocessforthesimulation. Multipletomographicimage data of the head of a patient to be subj ected to the surgical orthodontic operation is required for simulating the surgical orthodonticoperationin themedical simulation apparatus.
The multiple tomographic image data is obtained, for example, by taking a multiplicity of tomograms by a tomographic apparatus such as a CT apparatus or an MRI
apparatus, and inputted into the unit body 1 of the medical simulation apparatus via the removable disk 3. That is, the multiple tomographic image data obtained by the tomographic apparatus is written in the removable disk 3. The removable disk 3 containing the multiple tomographic image data written therein is set in the removable disk reader/writer 4. Upon input of a data reading command to the unit body 1 from the input device 2, the multiple tomographic image data is read out of the removable disk 3 by the removable disk reader/writer 4, and the multiple tomograpr~ic image data thus read out is applied to the unit body 1 ( Step Si ) . Thus, the multiple ' ' CA 02465102 2004-04-23
Fig. 2 is a flow chart illustrating the flow of aprocessforthesimulation. Multipletomographicimage data of the head of a patient to be subj ected to the surgical orthodontic operation is required for simulating the surgical orthodonticoperationin themedical simulation apparatus.
The multiple tomographic image data is obtained, for example, by taking a multiplicity of tomograms by a tomographic apparatus such as a CT apparatus or an MRI
apparatus, and inputted into the unit body 1 of the medical simulation apparatus via the removable disk 3. That is, the multiple tomographic image data obtained by the tomographic apparatus is written in the removable disk 3. The removable disk 3 containing the multiple tomographic image data written therein is set in the removable disk reader/writer 4. Upon input of a data reading command to the unit body 1 from the input device 2, the multiple tomographic image data is read out of the removable disk 3 by the removable disk reader/writer 4, and the multiple tomograpr~ic image data thus read out is applied to the unit body 1 ( Step Si ) . Thus, the multiple ' ' CA 02465102 2004-04-23
13 tomographic image data read into the unit body 1 is stored in the hard disk incorporated in the unit body 1 (Step S2 ) .
Whenathree-dimensionalimagedisplayingcommand is thereafter applied to the unit body 1 from the input device 2 (YES in Step S3) , the multiple tomographic image data stored in the hard disk in the unit body 1 is stereographically reconstructed, and three-dimensional imagedataisgenerated. Then,athree-dimensionalimage of craniofacial bones of the patient' s head is displayed on the display 5 on the basis of the three-dimensional image data (Step 54).
An upper dental arch model and a lower dental arch model (entity model) of the patient to be subjected to the surgical orthodontic operation are required for the simulation of the surgical orthodontic operation in the medical simulation apparatus. Therefore, an upper dental arch model 61 and a lower dental arch model 62 as shown in Fig. 3(a) are produced from gypsum plaster or a resin material on the basis of the entity of the patient before the start of the simulation. Three reference marks MKl, MK2, MK3 are provided on a surface of the upper dental arch model 61 as reference points for defining a coordinate system when acquiring coordinates by means of the three-dimensional measuring ' ' CA 02465102 2004-04-23
Whenathree-dimensionalimagedisplayingcommand is thereafter applied to the unit body 1 from the input device 2 (YES in Step S3) , the multiple tomographic image data stored in the hard disk in the unit body 1 is stereographically reconstructed, and three-dimensional imagedataisgenerated. Then,athree-dimensionalimage of craniofacial bones of the patient' s head is displayed on the display 5 on the basis of the three-dimensional image data (Step 54).
An upper dental arch model and a lower dental arch model (entity model) of the patient to be subjected to the surgical orthodontic operation are required for the simulation of the surgical orthodontic operation in the medical simulation apparatus. Therefore, an upper dental arch model 61 and a lower dental arch model 62 as shown in Fig. 3(a) are produced from gypsum plaster or a resin material on the basis of the entity of the patient before the start of the simulation. Three reference marks MKl, MK2, MK3 are provided on a surface of the upper dental arch model 61 as reference points for defining a coordinate system when acquiring coordinates by means of the three-dimensional measuring ' ' CA 02465102 2004-04-23
14 instrument 7 . Further, three measurement marks MP1, MP2, MP3 are provided on a surface of the lower dental arch model 62.
A dentist or an operator fixes the upper dental arch model 61 at a predetermined position, and positions the lower dental arch model 62 with respect to the upper dental arch model 61 in the same occlusal relation as the current occlusal state of the patient. Thereafter, a reference point coordinate acquiring command is inputted into the unit body 1 by operating the input device 2. The dentist or the operator operates the input device 2 to put reference marks PKl, PK2, PK3 at positions corresponding to the reference marks MKl, MK2, MK3 provided on the upper dental arch model 61 in the three-dimensional image displayed on the display 5.
When the reference point coordinate acquiring command is inputted to the unit body 1 (YES in Step S5) , the coordinates (hereinafter referred to as "model coordinates") of the measurement marks MPl, MP2, MP3 on the surface of the lower dental arch model 62 in the coordinate system defined by the three reference marks MK1, MK2, MK3 are acquired by the three-dimensional measuring instrument 7 (Step S6) . The model coordinates of the measurement marks MP1, MP2, MP3 thus acquired are applied to the unit body 1, and converted into cocrdinates ' CA 02465102 2004-04-23 (hereinafter referred to as "image coordinates") in a coordinate system defined by the reference marks PK1, PK2, PK3 on the basis of,a relationship between the reference marks MK1, MK2, MK3 and the reference marks 5 PK1, PK2, PK3 (Step S7). Then, positions PPl, PP2, PP3 represented by the image coordinates obtained through the coordinate conversion are displayed on the three-dimensional image displayed on the display 5 as shown in Fig. 3(b) (Step S8).
10 Next, the dentist displaces the lower dental arch model 62 to a position at which protrusion of the upper jawbone or the lower jawbone or jaw deformity is corrected and the upper dental arch and the lower dental arch are kept in proper occlusal relation as shown in Fig. 3 (c) .
A dentist or an operator fixes the upper dental arch model 61 at a predetermined position, and positions the lower dental arch model 62 with respect to the upper dental arch model 61 in the same occlusal relation as the current occlusal state of the patient. Thereafter, a reference point coordinate acquiring command is inputted into the unit body 1 by operating the input device 2. The dentist or the operator operates the input device 2 to put reference marks PKl, PK2, PK3 at positions corresponding to the reference marks MKl, MK2, MK3 provided on the upper dental arch model 61 in the three-dimensional image displayed on the display 5.
When the reference point coordinate acquiring command is inputted to the unit body 1 (YES in Step S5) , the coordinates (hereinafter referred to as "model coordinates") of the measurement marks MPl, MP2, MP3 on the surface of the lower dental arch model 62 in the coordinate system defined by the three reference marks MK1, MK2, MK3 are acquired by the three-dimensional measuring instrument 7 (Step S6) . The model coordinates of the measurement marks MP1, MP2, MP3 thus acquired are applied to the unit body 1, and converted into cocrdinates ' CA 02465102 2004-04-23 (hereinafter referred to as "image coordinates") in a coordinate system defined by the reference marks PK1, PK2, PK3 on the basis of,a relationship between the reference marks MK1, MK2, MK3 and the reference marks 5 PK1, PK2, PK3 (Step S7). Then, positions PPl, PP2, PP3 represented by the image coordinates obtained through the coordinate conversion are displayed on the three-dimensional image displayed on the display 5 as shown in Fig. 3(b) (Step S8).
10 Next, the dentist displaces the lower dental arch model 62 to a position at which protrusion of the upper jawbone or the lower jawbone or jaw deformity is corrected and the upper dental arch and the lower dental arch are kept in proper occlusal relation as shown in Fig. 3 (c) .
15 Thereafter, the dentist or the operator operates the input device 2 to input a coordinate acquiring command to the unit body l, and further operates the input device 2 to specify a region (hatched region) corresponding to the jawbone to be displaced by the surgical orthodontic operation on the three-dimensional image displayed on the display 5.
When the coordinate acquiring command is inputted to the unit body 1 after the displacement of the lower dental arch model 62 (YES in Step S9), the model coordinates of the measurement marks MP1, MP2, MP3 on
When the coordinate acquiring command is inputted to the unit body 1 after the displacement of the lower dental arch model 62 (YES in Step S9), the model coordinates of the measurement marks MP1, MP2, MP3 on
16 the surface of the lower dental arch model 62 after the displacement are acquired by the three-dimensional measuring instrument 7 (Step S10) . The model coordinates of the measurement marks MP1, MP2, MP3 thus acquired are applied to the unit body 1, and converted into image coordinates on the basis of the relationship between the reference marks MKl, MK2, MK3 and the reference marks PKl, PK2, PK3 (Step S11) .
Thereafter, the displacement direction and displacement amount of the region (to-be-displaced region) of the three-dimensional image corresponding to the j awbone to be displaced by the surgical orthodontic operation are computed on the basis of changes in the image coordinates of the measurement marks MPl, MP2, MP3 after the displacement of the lower dental arch model 62 (Step S12) . That is, the displacement directions and displacement amounts of all points within the to-be-displaced region of the thfee-dimensional image are computed according to the changes in the image coordinates of the measurement marks MPl, MP2, MP3 . Then, the to-be-displaced region is displaced in the three-dimensional image as shown in Fig. 3 (d) on the basis of the displacement directions and the displacement amounts thus computed (Step S13).
After the displacement of the region, it is judged
Thereafter, the displacement direction and displacement amount of the region (to-be-displaced region) of the three-dimensional image corresponding to the j awbone to be displaced by the surgical orthodontic operation are computed on the basis of changes in the image coordinates of the measurement marks MPl, MP2, MP3 after the displacement of the lower dental arch model 62 (Step S12) . That is, the displacement directions and displacement amounts of all points within the to-be-displaced region of the thfee-dimensional image are computed according to the changes in the image coordinates of the measurement marks MPl, MP2, MP3 . Then, the to-be-displaced region is displaced in the three-dimensional image as shown in Fig. 3 (d) on the basis of the displacement directions and the displacement amounts thus computed (Step S13).
After the displacement of the region, it is judged
17 whether or not a three-dimensional image display ending command is applied to the unit body 1 from the input device 2 (Step S14). If the three-dimensional image display ending command is not applied, the process returns to Step S9 to judge whether or not the coordinate acquiring command is applied to the unit body 1 from the input device 2. The judgment on the application of the coordinate acquiringcommandorthe three-dimensional image display ending command is repeated until either the coordinate acquiring commandorthethree-dimensional image display ending command is applied. Then, if the coordinate acquiring command is applied in this period (YES in Step S9) , the aforesaid process sequence from Step S10 to S13 is performed. If the three-dimensional image display ending command is applied (YES in Step S14 ) , the simulation of the surgical orthodontic operation in the medical simulation apparatus is completed.
In the medical simulation apparatus, when the lower dental arch model 62 is displaced, the region preliminarily specified in the three-dimensional image of the patient displayed on the display 5 (the region corresponding to the jawbone to be displaced by the surgical orthodontic operation) is correspondingly displaced as described above. That is, in the medical simulationapparatus, function~linformationsuch as the
In the medical simulation apparatus, when the lower dental arch model 62 is displaced, the region preliminarily specified in the three-dimensional image of the patient displayed on the display 5 (the region corresponding to the jawbone to be displaced by the surgical orthodontic operation) is correspondingly displaced as described above. That is, in the medical simulationapparatus, function~linformationsuch as the
18 contact state of the upper and lower dental arches can be reflected on the change in the three-dimensional image of the patient. Thus, the, dentist can determine, on the basis of the display on the display 5, where the lower jawbone to be displaced by the surgical orthodontic operation is to be fixed, which tooth is to be displaced and how the tooth is to be displaced through postoperative orthodontics, in order to achieve an optimum occlusal state and an optimum morphological change of the entire head.
Further, the multiple tomographic image data of the patient's head includes image data of soft tissues such as skin and subcutaneous tissues, so that a three-dimensional image including an image of the soft tissues of the patient can be displayed on the display 5 as shown in Fig. 3 (e) on the basis of the image data.
Then, a region of the three-dimensional image corresponding to the jawbone to be displaced by the surgical orthodontic operation and the soft tissues associated with the jawbone is displaced in the three-dimensional image correspondingly to the displacement of the lower dental arch model 62, whereby the three-dimensional image including the image of the soft tissues of the patient after the operation is displayed on the display 5 as shown in Fig. 3 (f) . Thus,
Further, the multiple tomographic image data of the patient's head includes image data of soft tissues such as skin and subcutaneous tissues, so that a three-dimensional image including an image of the soft tissues of the patient can be displayed on the display 5 as shown in Fig. 3 (e) on the basis of the image data.
Then, a region of the three-dimensional image corresponding to the jawbone to be displaced by the surgical orthodontic operation and the soft tissues associated with the jawbone is displaced in the three-dimensional image correspondingly to the displacement of the lower dental arch model 62, whereby the three-dimensional image including the image of the soft tissues of the patient after the operation is displayed on the display 5 as shown in Fig. 3 (f) . Thus,
19 a change in the facial appearance of the patient attributable to the surgical orthodontic operation can easily be predicted and evaluated.
Figs. 4 are diagrams for explaining another embodiment of the present invention. In the aforesaid embodiment, the upper dental arch model 61 and the lower dental arch model 62 are produced as the entity model on the basis of the entity of the patient before the start of the simulation. In this embodiment, on the contrary, an entity model 8 of the craniofacial bones of the patient is produced on the basis of the three-dimensional image data generated by stereographic reconstruction of the multiple tomographic image data of the patient. Then, a simulation can be performed by correlating the entity model 8 with the three-dimensional image of the craniofacial bones.
That is, when the three-dimensional image displaying command is applied after the multiple tomographic image data is read into the unit body 1 (see Fig. 1), three-dimensional image data is generated on the basis of the multiple tomographic image data, and theresultingthree-dimensionalimageofthecraniofacial bones of the patient' s head is displayed on the display 5 as shown in Fig. 4 (a) .
Thereafter, the dentist cr the operator specifies ' CA 02465102 2004-04-23 a region thatched region) corresponding to the jawbone to be displaced by the surgical orthodontic operation in the three-dimensional image displayed on the display 5. Then, three marks PPl, PP2, PP3 are inputted on the 5 specified to-be-displaced region, and three reference marks PK1, PK2, PK3 are inputted in a region other than the specified to-be-displaced region for defining a coordinate system.
After the input of the marks PP1, PP2, PP3 and the 10 reference marks PK1, PK2, PK3, three-dimensional image data including data of the marks PPl, PP2, PP3 and the referencemarks PK1, PK2, PK3 is applied to a stereographic model producing apparatus (not shown). The stereographic model producing apparatus is adapted to 15 produce a stereographic model, for example, by a photo-shaping method. Upon receiving the three-dimensional image data, the stereographic model producing apparatus produces the stereographic model (entity model ) 8 of the craniofacial bones of the patient' s
Figs. 4 are diagrams for explaining another embodiment of the present invention. In the aforesaid embodiment, the upper dental arch model 61 and the lower dental arch model 62 are produced as the entity model on the basis of the entity of the patient before the start of the simulation. In this embodiment, on the contrary, an entity model 8 of the craniofacial bones of the patient is produced on the basis of the three-dimensional image data generated by stereographic reconstruction of the multiple tomographic image data of the patient. Then, a simulation can be performed by correlating the entity model 8 with the three-dimensional image of the craniofacial bones.
That is, when the three-dimensional image displaying command is applied after the multiple tomographic image data is read into the unit body 1 (see Fig. 1), three-dimensional image data is generated on the basis of the multiple tomographic image data, and theresultingthree-dimensionalimageofthecraniofacial bones of the patient' s head is displayed on the display 5 as shown in Fig. 4 (a) .
Thereafter, the dentist cr the operator specifies ' CA 02465102 2004-04-23 a region thatched region) corresponding to the jawbone to be displaced by the surgical orthodontic operation in the three-dimensional image displayed on the display 5. Then, three marks PPl, PP2, PP3 are inputted on the 5 specified to-be-displaced region, and three reference marks PK1, PK2, PK3 are inputted in a region other than the specified to-be-displaced region for defining a coordinate system.
After the input of the marks PP1, PP2, PP3 and the 10 reference marks PK1, PK2, PK3, three-dimensional image data including data of the marks PPl, PP2, PP3 and the referencemarks PK1, PK2, PK3 is applied to a stereographic model producing apparatus (not shown). The stereographic model producing apparatus is adapted to 15 produce a stereographic model, for example, by a photo-shaping method. Upon receiving the three-dimensional image data, the stereographic model producing apparatus produces the stereographic model (entity model ) 8 of the craniofacial bones of the patient' s
20 head on the basis of the three-dimensional image data.
Measurement marks MPl, MP2, MP3 and reference marks MK1, MK2, MK3 are respectively provided at positions corresponding to the marks PPl, PP2, PP3 and the reference marks PK1, PK2, PK3 on the prcduced entity model 8 as shown. in Fig. 4 (b) .
Measurement marks MPl, MP2, MP3 and reference marks MK1, MK2, MK3 are respectively provided at positions corresponding to the marks PPl, PP2, PP3 and the reference marks PK1, PK2, PK3 on the prcduced entity model 8 as shown. in Fig. 4 (b) .
21 Then, the dentist or the operator fixes, for example, a cranial portion of the entity model 8 at a predetermined position, and inputs the coordinate acquiring command to the unit body 1. Upon the input of the coordinate acquiring command to the unit body l, the model coordinates of the measurement marks MP1, MP2, MP3 provided on the entity model 8 ( in a coordinate system defined by the three reference marks MKl, MK2, MK3) are acquired by the three-dimensional measuring instrument 7 (see Fig. 1) . The model coordinates of the measurement marks MP1, MP2, MP3 thus acquired are applied to the unit body 1, and converted into image coordinates (in a coordinate system defined by the reference marks PKl, PK2, PK3) on the basis of a relationship between the reference marks MK1, MK2, MK3 and the reference marks PKl, PK2, PK3.
Thereafter, the dentist displaces a lower jawbone portion of the entity model 8 to'a position at which protrusion of the upper jawbone or the lower jawbone or jaw deformity is corrected and the upper dental arch and the lower dental arch are kept in proper occlusal relation as shown in Fig. 4 (c) , and inputs the coordinate acquiring command to the unit body 1. Upon the input of the coordinate acquiring command to the uni t body 1, the model coordinates of the measurement marks MP1, MP2, MF3 after
Thereafter, the dentist displaces a lower jawbone portion of the entity model 8 to'a position at which protrusion of the upper jawbone or the lower jawbone or jaw deformity is corrected and the upper dental arch and the lower dental arch are kept in proper occlusal relation as shown in Fig. 4 (c) , and inputs the coordinate acquiring command to the unit body 1. Upon the input of the coordinate acquiring command to the uni t body 1, the model coordinates of the measurement marks MP1, MP2, MF3 after
22 the displacement are acquired by the three-dimensional measuring instrument 7. The model coordinates of the measurement marks MP1, MP2, MP3 thus acquired are applied to the unit body l, and converted into image coordinates on the basis of the relationship between the reference marks MK1, MK2, MK3 and the reference marks PK1, PK2, PK3.
Then, the displacementdirectionand displacement amountoftheto-be-displacedregion previouslyspecified in the three-dimensional image are computed on the basis of changes in the image coordinates of the measurement marks MP1, MP2, MP3 after the displacement of the lower jawbone portion of the entity model 8. That is, the displacement directions and displacement amounts of all points within the to-be-displaced region of the three-dimensional image are computed in accordance with the changes in the image coordinates of the measurement marks MP1, MP2, MP3. Then, the to-be-displaced region is displaced in the three-dimensional image as shown in Fig. 4(d) on the basis of the displacement directions and displacement amounts thus computed.
Therefore, the dentist can determine, on the basis of the change in the three-dimensional image after the displacement of the entity model 8, where the lower jawbone to be displaced by the surgical orthodontic operation
Then, the displacementdirectionand displacement amountoftheto-be-displacedregion previouslyspecified in the three-dimensional image are computed on the basis of changes in the image coordinates of the measurement marks MP1, MP2, MP3 after the displacement of the lower jawbone portion of the entity model 8. That is, the displacement directions and displacement amounts of all points within the to-be-displaced region of the three-dimensional image are computed in accordance with the changes in the image coordinates of the measurement marks MP1, MP2, MP3. Then, the to-be-displaced region is displaced in the three-dimensional image as shown in Fig. 4(d) on the basis of the displacement directions and displacement amounts thus computed.
Therefore, the dentist can determine, on the basis of the change in the three-dimensional image after the displacement of the entity model 8, where the lower jawbone to be displaced by the surgical orthodontic operation
23 is to be fixed, which tooth is to be displaced and how the tooth is to be displaced through postoperative orthodontics, in order to achieve an optimum occlusal state and an optimum morphological change of the entire head. Further, three-dimensional images each including an image of the soft tissues of the patient before and after the operation are displayed on the display 5 as shown in Figs . 9 ( a ) and 4 ( f ) on the basis of image data of the soft tissues included in the multiple tomographic image data of the patient' s head. Thus, a change in the facial appearance of the patient attributable to the surgical orthodontic operation can easily be predicted and evaluated.
Although the explanation has thus been given to the simulations to be performed when the lower j awbone is to be displaced by the surgical orthodontic operation in the two embodiments of the present invention, it is possible to perform any other simulations.
For example, after a three-dimensional image of the craniofacial bones is displayed on the display 5 as shown in Fig . 5 ( a ) , an entity model 9 according to the three-dimensional image as shown in Fig. 5 (b) is produced by a photo-shaping method. Thereafter, an abscission line for the surgical operation is drawn on the entity model 9 as indicated by a broken line in Fig. 5 (c) . Then,
Although the explanation has thus been given to the simulations to be performed when the lower j awbone is to be displaced by the surgical orthodontic operation in the two embodiments of the present invention, it is possible to perform any other simulations.
For example, after a three-dimensional image of the craniofacial bones is displayed on the display 5 as shown in Fig . 5 ( a ) , an entity model 9 according to the three-dimensional image as shown in Fig. 5 (b) is produced by a photo-shaping method. Thereafter, an abscission line for the surgical operation is drawn on the entity model 9 as indicated by a broken line in Fig. 5 (c) . Then,
24 the model coordinates of points on the abscission line thus drawn are acquired by the three-dimensional measuring instrument 7 (see Fig. 1), and the model coordinates thus acquired are applied to the unit body 1 (see Fig. 1), whereby a line corresponding to the abscission line drawn on the entity model 9 is displayed in the three-dimensional image as shown in Fig. 5(d).
Thus, the abscission line can be displayed at a more accurate position in the three-dimensional image than in the case where the dentist or the operator manually draws an abscission line in the three-dimensional image (e.g., by operating the mouse) while viewing the abscission line drawn on the entity model 9. Further, a sectional image taken along the abscission line displayedinthethree-dimensionalimagecan bedisplayed on the display 5 as shown in Fig. 5(e) on the basis of the multiple tomographic image data taken into the unit bodylfor displayingthe three-dimensional image. This makes it possible to predict an influence of the abscission and the like and determine an optimum abscission position.
It is also possible to perform a simulation of implantation of a dental implant. Where the dental implant is to be implanted in the lower jawbone, for example, a three-dimensional image of the lower jawbone is displayed on the display 5 as shcwn ir. Fig. 6(a) on the basis of the multiple tomographic image data, and then an entity model 10 according to the three-dimensional image is produced by a photo-shaping method. In turn, a dental implant 11 having a predetermined length is 5 implanted in the entity model 10 as shown in Fig. 6 (b) .
Thereafter, the model coordinates of an upper end point of the dental implant 11 and the model coordinates of an implantation point (insertion point) are acquired by the three-dimensional measuring instrument 7 (see Fig.
10 1 ) , and the model coordinates thus acquired are applied to the unit body 1 (see Fig. 1). Then, the model coordinates of the upper end point of the dental implant 11 and the implantation point are converted into image coordinates in the unit body 1, and an image of the dental 15 implant 11 is displayed together with the three-dimensional image as shown in Fig. 6 (c) on the basis of the image coordinates of the upper end point of the dental implant 11 and the implantation point obtained by the coordinate conversion and data of the length of 20 thedentalimplantllpreliminarilyinputted. Thismakes it possible to check if the implantation direction and depth of the dental implant 11 is appropriate, while viewing the display 5, and to properly determine the implantation direction and depth of the dental implant
Thus, the abscission line can be displayed at a more accurate position in the three-dimensional image than in the case where the dentist or the operator manually draws an abscission line in the three-dimensional image (e.g., by operating the mouse) while viewing the abscission line drawn on the entity model 9. Further, a sectional image taken along the abscission line displayedinthethree-dimensionalimagecan bedisplayed on the display 5 as shown in Fig. 5(e) on the basis of the multiple tomographic image data taken into the unit bodylfor displayingthe three-dimensional image. This makes it possible to predict an influence of the abscission and the like and determine an optimum abscission position.
It is also possible to perform a simulation of implantation of a dental implant. Where the dental implant is to be implanted in the lower jawbone, for example, a three-dimensional image of the lower jawbone is displayed on the display 5 as shcwn ir. Fig. 6(a) on the basis of the multiple tomographic image data, and then an entity model 10 according to the three-dimensional image is produced by a photo-shaping method. In turn, a dental implant 11 having a predetermined length is 5 implanted in the entity model 10 as shown in Fig. 6 (b) .
Thereafter, the model coordinates of an upper end point of the dental implant 11 and the model coordinates of an implantation point (insertion point) are acquired by the three-dimensional measuring instrument 7 (see Fig.
10 1 ) , and the model coordinates thus acquired are applied to the unit body 1 (see Fig. 1). Then, the model coordinates of the upper end point of the dental implant 11 and the implantation point are converted into image coordinates in the unit body 1, and an image of the dental 15 implant 11 is displayed together with the three-dimensional image as shown in Fig. 6 (c) on the basis of the image coordinates of the upper end point of the dental implant 11 and the implantation point obtained by the coordinate conversion and data of the length of 20 thedentalimplantllpreliminarilyinputted. Thismakes it possible to check if the implantation direction and depth of the dental implant 11 is appropriate, while viewing the display 5, and to properly determine the implantation direction and depth of the dental implant
25 11. It is also possible tc confirm a positional
26 relationship between the dental implant and tissues (a blood vessel and the like) which should not be damaged, while displaying a sectional image of the lower j awbone on the display 5 as shown in Figs. 6 (d) and 6 (e) on the basis of the multiple tomographic image data taken into the unit body 1 for displaying the three-dimensional image.
Other various modifications may be made within the scope of the present invention defined by the claims.
Other various modifications may be made within the scope of the present invention defined by the claims.
Claims (6)
1. A medical simulation apparatus comprising:
image display means which displays a three-dimensional image of a patient; and display controlling means which correlates an entity model of the patient with the three-dimensional image by utilizing at least three reference points on the entity model and at least three reference points on the three-dimensional image, and changes the three-dimensional image according to a change in the entity model.
image display means which displays a three-dimensional image of a patient; and display controlling means which correlates an entity model of the patient with the three-dimensional image by utilizing at least three reference points on the entity model and at least three reference points on the three-dimensional image, and changes the three-dimensional image according to a change in the entity model.
2. A medical simulation apparatus as set forth in claim 1, wherein the change in the entity model includes displacing a predetermined portion of the entity model, wherein the display controlling means determines changes in coordinates of points on the three-dimensional image corresponding to at least three points on the predetermined portion after the displacement of the predetermined portion on the basis of a relationship between the reference points on the entity model and the reference points on the three-dimensional image, and displaces a region of the three-dimensional image corresponding to the predetermined portion on the basis of the determined c0ordinate changes.
3. A medical simulation apparatus as set forth in claim 2, wherein the entity model comprises upper and lower dental arch models, wherein the predetermined portion is the upper dental arch model or the lower dental arch model.
4. A medical simulation apparatus as set forth in claim 2 or 3, wherein the entity model is a model formed of gypsum plaster or a resin material on the basis of the entity of the patient, wherein the predetermined portion corresponds to a portion of the entity of the patient to be displaced by a surgical operation.
5. A medical simulation apparatus as set forth in any of claims 1 to 4, wherein the change in the entity model includes providing a dot or a line on the entity model, wherein the display controlling means determines coordinates of a point or points on the three-dimensional image corresponding to the dot or points on the line provided on the entity model on the basis of the relationship between the reference points on the entity model and the reference points on the three-dimensional image, and displays an image of the dot or the line provided on the entity model in the three-dimensional image on the basis of the determined point coordinates.
6. A three-dimensional image display controlling method for a medical simulation apparatus, the method comprising:
displaying a three-dimensional image of a patient on image display means;
correlating an entity model with the three-dimensional image by utilizing at least three reference points on the entity model and at least three reference points on the three-dimensional image; and changing the three-dimensional image displayed on the image display means according to a change in the entity model.
displaying a three-dimensional image of a patient on image display means;
correlating an entity model with the three-dimensional image by utilizing at least three reference points on the entity model and at least three reference points on the three-dimensional image; and changing the three-dimensional image displayed on the image display means according to a change in the entity model.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005094718A1 (en) * | 2004-03-04 | 2005-10-13 | Marcello Marchesi | Method for generating and processing images for use in dentistry |
CN109310485A (en) * | 2016-06-21 | 2019-02-05 | 克利尔柯莱克特运营有限公司 | Orthodontic Treatment simulation with the improved graphics process for Dummy modeling |
Families Citing this family (76)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7362890B2 (en) * | 2001-05-24 | 2008-04-22 | Astra Tech Inc. | Registration of 3-D imaging of 3-D objects |
TW558689B (en) * | 2002-08-30 | 2003-10-21 | Univ Taipei Medical | Three-dimensional surgery simulation system and method |
JP4590627B2 (en) * | 2004-03-31 | 2010-12-01 | 国立大学法人 名古屋工業大学 | Acupuncture training system using force and touch |
ITPD20040164A1 (en) * | 2004-06-24 | 2004-09-24 | Gianni Lazzarato | DEVICE FOR DYNAMIC DETERMINATION OF THE ORIENTATION OF SURGICAL TEMPLATES ON REFERENCE MASKS FOR THE PREPARATION OF IMPLANTOLOGICAL SITES TO BE REALIZED IN DENTAL, ORTHOPEDIC AND SIMILAR SURGERY |
GB0414277D0 (en) * | 2004-06-25 | 2004-07-28 | Leuven K U Res & Dev | Orthognatic surgery |
JP2008513094A (en) | 2004-09-14 | 2008-05-01 | オラティオ ビー.ブイ. | Manufacturing and mounting method of ceramic dental implant with aesthetic implant abutment |
EP1808129B1 (en) * | 2004-09-24 | 2017-05-03 | iCAT CORPORATION | Cross section information detection device |
US7862336B2 (en) * | 2004-11-26 | 2011-01-04 | Cadent Ltd. | Method and system for providing feedback data useful in prosthodontic procedures associated with the intra oral cavity |
GB0507204D0 (en) * | 2005-04-08 | 2005-05-18 | Leuven K U Res & Dev | Maxillofacial and plastic surgery |
JP4899064B2 (en) * | 2005-08-19 | 2012-03-21 | 国立大学法人 岡山大学 | Teeth occlusion correction support device, program, and recording medium |
DE102005040740A1 (en) * | 2005-08-26 | 2007-03-01 | "Stiftung Caesar" (Center Of Advanced European Studies And Research) | Method for registering dental models |
JP4738152B2 (en) * | 2005-12-02 | 2011-08-03 | 富士通株式会社 | Simulation program to support dental treatment |
US7698014B2 (en) * | 2006-01-20 | 2010-04-13 | 3M Innovative Properties Company | Local enforcement of accuracy in fabricated models |
US7912257B2 (en) | 2006-01-20 | 2011-03-22 | 3M Innovative Properties Company | Real time display of acquired 3D dental data |
WO2007117586A2 (en) | 2006-04-08 | 2007-10-18 | Allan Millman | Method and system for interactive simulation of materials |
US8786613B2 (en) | 2006-04-08 | 2014-07-22 | Alan Millman | Method and system for interactive simulation of materials and models |
US7953260B2 (en) * | 2006-06-09 | 2011-05-31 | Craniosim Solutions, Inc. | Predicting movement of soft tissue of the face in response to movement of underlying bone |
US8442283B2 (en) * | 2006-08-30 | 2013-05-14 | Anatomage Inc. | Patient-specific three-dimensional dentition model |
WO2008039048A1 (en) * | 2006-09-27 | 2008-04-03 | Aldo Arvizo Arvizo | Solid models for medical diagnosis |
KR100854634B1 (en) * | 2006-11-29 | 2008-08-27 | 강릉대학교산학협력단 | Automatic tooth movement measuring method employing three dimensional reverse engineering technique |
DE102007002144A1 (en) * | 2007-01-15 | 2008-07-17 | Aepsilon Rechteverwaltungs Gmbh | Procedures relating to implants and a computer-readable medium and a computer |
TWI323171B (en) * | 2007-06-27 | 2010-04-11 | Univ Nat Cheng Kung | Cephalogram image analysis method |
CN101406412B (en) * | 2007-10-09 | 2010-06-02 | 宝钰生技股份有限公司 | Method for producing digital tooth implantation planning auxiliary assembly |
US8795204B2 (en) | 2008-01-09 | 2014-08-05 | Allergan, Inc. | Anatomical recognition and dimensional analysis of breast volume to assist breast surgery |
US8888717B2 (en) * | 2008-01-09 | 2014-11-18 | Allergan, Inc. | Anatomical recognition and dimensional analysis of breast measurements to assist breast surgery |
JP5390377B2 (en) * | 2008-03-21 | 2014-01-15 | 淳 高橋 | 3D digital magnifier surgery support system |
KR100971762B1 (en) * | 2008-08-28 | 2010-07-26 | 주식회사바텍 | Method and apparatus for generating virtual teeth, and the recording media storing the program performing the said method |
US8662900B2 (en) | 2009-06-04 | 2014-03-04 | Zimmer Dental Inc. | Dental implant surgical training simulation system |
CN101604354B (en) * | 2009-07-17 | 2011-05-04 | 南京航空航天大学 | Method for accurately recovering single tooth form on three-dimensional tooth-mandible model |
EP2722818B1 (en) * | 2009-09-04 | 2019-11-06 | Medicim NV | Method for digitizing dento-maxillofacial objects |
TW201114409A (en) * | 2009-10-22 | 2011-05-01 | Metal Ind Res & Dev Ct | Manufacture method of surgery guide template |
DE102010000451A1 (en) * | 2010-02-17 | 2011-08-18 | Amann Girrbach Ag | Digital three-dimensional data model creating method for upper and lower jaws of patient, involves creating model by arrangement of upper and lower jaw data models relative to each other in bite layer or by association of detected marks |
KR101108627B1 (en) * | 2010-03-23 | 2012-01-31 | 이태경 | Plate with reference marker for the image reconstruction of occlusal relationship |
JPWO2012004937A1 (en) * | 2010-07-07 | 2013-09-02 | 有限会社シエスタ | Implant design method, implant design apparatus, and implant design program |
KR101223937B1 (en) * | 2011-02-22 | 2013-01-21 | 주식회사 모르페우스 | Face Image Correcting Simulation Method And System Using The Same |
US10092373B2 (en) * | 2011-05-15 | 2018-10-09 | Orametrix, Inc. | Orthodontic treatment planning using lip tracer |
KR101138355B1 (en) * | 2011-06-16 | 2012-04-26 | 김태원 | System providing estimation information for teeth alignment and method thereof |
KR101109424B1 (en) * | 2011-06-16 | 2012-01-30 | 김태원 | Manufacturing method for clear aligner |
KR101138354B1 (en) * | 2011-06-16 | 2012-04-26 | 김태원 | System providing align teeth data |
WO2013008963A1 (en) * | 2011-07-12 | 2013-01-17 | Yi Tae Kyoung | Image-based coordinate synchronizing plate |
JP2013226352A (en) * | 2012-03-26 | 2013-11-07 | Cephmedical Corp | Method for calculating indication for deciding necessity of jaw bone surgery in orthodontic treatment, method for deciding necessity of jaw bone surgery in orthodontic treatment, method for calculating the indication for deciding disharmony between upper and lower jaw bones, method for deciding the disharmony between upper and lower jaw bones, method for calculating the indication for deciding jaw deformity, method for deciding jaw deformity, method for calculating the indication for deciding undergrowth/overgrowth of maxilla, method for calculating the indication for deciding undergrowth/overgrowth of mandible, program, and computer |
JP4926292B1 (en) * | 2011-09-16 | 2012-05-09 | 大樹 平林 | Jaw bone surgery necessity index calculation method in orthodontic treatment, Jaw bone surgery necessity judgment method in orthodontic treatment, Maxillary bone discord judgment index method in dental treatment, Maxillary bone discord judgment method in dental treatment, Programs and computers |
US8827932B2 (en) | 2011-09-16 | 2014-09-09 | Daiki HIRABAYASHI | Orthodontic, dental, and dentofacial deformity indexing system and method |
EP2702958A4 (en) * | 2011-09-16 | 2014-11-05 | Cephmedical Corp | Dental treatment diagnostic method, method for calculating determination indicators, program and computer |
CN103390365B (en) * | 2012-05-08 | 2016-07-06 | 医百科技股份有限公司 | The teaching and training method of intraoral operation |
EP4029470A1 (en) | 2012-05-17 | 2022-07-20 | DePuy Synthes Products, LLC | Method of surgical planning |
CN102764163B (en) * | 2012-07-27 | 2015-01-21 | 艾博莱特(苏州)科技有限公司 | Novel optical three-dimensional imaging device |
KR101439283B1 (en) * | 2012-08-08 | 2014-09-11 | 권순용 | Medical/Dental Treating Simulation Method And System For The Same |
JP5883816B2 (en) * | 2013-03-11 | 2016-03-15 | 株式会社ミウラ | Facial prediction method and system after jaw deformity surgery |
DE102013211200B4 (en) * | 2013-06-14 | 2018-11-29 | Kulzer Gmbh | Scannable spoon for making a dental prosthesis |
CN106255473B (en) | 2014-02-21 | 2020-08-07 | 特里斯佩拉牙科公司 | Augmented reality dental design method and system |
GB201408031D0 (en) * | 2014-05-07 | 2014-06-18 | Univ Leeds | A dental model scanner |
US9626462B2 (en) * | 2014-07-01 | 2017-04-18 | 3M Innovative Properties Company | Detecting tooth wear using intra-oral 3D scans |
KR101651629B1 (en) | 2014-12-11 | 2016-09-05 | 주식회사 디오코 | Method for automatically moving object in simulation system and simulation system applying the same |
US20170360535A1 (en) * | 2014-12-22 | 2017-12-21 | Dental Wings Inc. | Pre-forms and methods for using same in the manufacture of dental prostheses |
KR101849705B1 (en) * | 2015-11-13 | 2018-05-30 | 한국전기연구원 | Method and system for generating 3D image using spectral x-ray and optical image |
EP3419554B1 (en) | 2016-02-24 | 2021-05-26 | 3Shape A/S | Detecting and monitoring development of a dental condition |
WO2017165566A1 (en) | 2016-03-25 | 2017-09-28 | The Regents Of The University Of California | High definition, color images, animations, and videos for diagnostic and personal imaging applications |
US11559378B2 (en) | 2016-11-17 | 2023-01-24 | James R. Glidewell Dental Ceramics, Inc. | Scanning dental impressions |
IT201700017965A1 (en) | 2017-02-17 | 2018-08-17 | Silvio Franco Emanuelli | METHOD AND SIMULATION SYSTEM OF SITE IMPLANT TO OPTIMIZED |
WO2018150384A1 (en) | 2017-02-17 | 2018-08-23 | Silvio Franco Emanuelli | System and method for monitoring optimal dental implants coupleable with an optimized implant site |
KR101918119B1 (en) * | 2017-03-10 | 2019-02-08 | 주식회사 모르페우스 | Method, system and non-transitory computer-readable recording medium for estimating anatomical layer of face |
WO2018164394A1 (en) * | 2017-03-10 | 2018-09-13 | 주식회사 모르페우스 | Method and system for providing information on result of procedure, and non-transitory computer-readable recording medium |
US10828130B2 (en) | 2017-03-20 | 2020-11-10 | Align Technology, Inc. | Automated 2D/3D integration and lip spline autoplacement |
CN110475525A (en) * | 2017-03-30 | 2019-11-19 | 株式会社Gc | It tries artificial tooth on, try artificial tooth production process on and artificial tooth production method |
US11823376B2 (en) | 2018-05-16 | 2023-11-21 | Benevis Informatics, Llc | Systems and methods for review of computer-aided detection of pathology in images |
US11553988B2 (en) * | 2018-06-29 | 2023-01-17 | Align Technology, Inc. | Photo of a patient with new simulated smile in an orthodontic treatment review software |
KR102099390B1 (en) * | 2018-08-21 | 2020-04-09 | 디디에이치 주식회사 | Dental image analyzing method for orthodontic daignosis and apparatus using the same |
CN109875684A (en) * | 2019-04-16 | 2019-06-14 | 北京大学第三医院(北京大学第三临床医学院) | A kind of prediction and real-time rendering method of mandibular angle bone cutting art |
CN109907827B (en) * | 2019-04-16 | 2020-07-14 | 北京大学第三医院(北京大学第三临床医学院) | Operation navigation system for mandibular angle osteotomy |
US11622843B2 (en) | 2019-06-25 | 2023-04-11 | James R. Glidewell Dental Ceramics, Inc. | Processing digital dental impression |
US11540906B2 (en) | 2019-06-25 | 2023-01-03 | James R. Glidewell Dental Ceramics, Inc. | Processing digital dental impression |
US11534271B2 (en) | 2019-06-25 | 2022-12-27 | James R. Glidewell Dental Ceramics, Inc. | Processing CT scan of dental impression |
US11544846B2 (en) | 2020-08-27 | 2023-01-03 | James R. Glidewell Dental Ceramics, Inc. | Out-of-view CT scan detection |
CN114305682B (en) * | 2020-09-29 | 2023-09-22 | 上海微创卜算子医疗科技有限公司 | Neural intervention navigation real-time positioning system and method |
CN114491700B (en) * | 2022-02-15 | 2022-10-11 | 杭州雅智医疗技术有限公司 | Display coordinate system calculation method and device of three-dimensional tooth model and application |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990008505A1 (en) * | 1989-01-24 | 1990-08-09 | Dolphin Imaging Systems Inc. | Method and apparatus for generating cephalometric images |
US5454717A (en) * | 1990-01-19 | 1995-10-03 | Ormco Corporation | Custom orthodontic brackets and bracket forming method and apparatus |
US5340309A (en) * | 1990-09-06 | 1994-08-23 | Robertson James G | Apparatus and method for recording jaw motion |
US5338198A (en) * | 1993-11-22 | 1994-08-16 | Dacim Laboratory Inc. | Dental modeling simulator |
JP3672966B2 (en) * | 1995-04-14 | 2005-07-20 | 株式会社ユニスン | Method and apparatus for creating dental prediction model |
EP0741994A1 (en) * | 1995-05-11 | 1996-11-13 | TRUPPE, Michael, Dr. | Method for presentation of the jaw |
JPH1066706A (en) | 1996-08-28 | 1998-03-10 | Technol Res Assoc Of Medical & Welfare Apparatus | Three-dimensional shape measuring auxiliary device for mouth cavity model |
US5879158A (en) * | 1997-05-20 | 1999-03-09 | Doyle; Walter A. | Orthodontic bracketing system and method therefor |
US6409504B1 (en) * | 1997-06-20 | 2002-06-25 | Align Technology, Inc. | Manipulating a digital dentition model to form models of individual dentition components |
US6152731A (en) * | 1997-09-22 | 2000-11-28 | 3M Innovative Properties Company | Methods for use in dental articulation |
US6081739A (en) * | 1998-05-21 | 2000-06-27 | Lemchen; Marc S. | Scanning device or methodology to produce an image incorporating correlated superficial, three dimensional surface and x-ray images and measurements of an object |
JP2001112743A (en) | 1999-10-18 | 2001-04-24 | Rikogaku Shinkokai | Three-dimensional jaw motion display device and method and storage medium storing three-dimensional jaw motion display program |
DE19952962B4 (en) * | 1999-11-03 | 2004-07-01 | Sirona Dental Systems Gmbh | Method for producing a drilling aid for a dental implant |
US7234937B2 (en) * | 1999-11-30 | 2007-06-26 | Orametrix, Inc. | Unified workstation for virtual craniofacial diagnosis, treatment planning and therapeutics |
US6947038B1 (en) * | 2000-04-27 | 2005-09-20 | Align Technology, Inc. | Systems and methods for generating an appliance with tie points |
JP4316114B2 (en) * | 2000-06-30 | 2009-08-19 | コニカミノルタホールディングス株式会社 | Model deformation method and modeling apparatus |
US6915178B2 (en) * | 2000-09-06 | 2005-07-05 | O'brien Dental Lab, Inc. | Dental prosthesis manufacturing process, dental prosthesis pattern & dental prosthesis made thereby |
US6726479B2 (en) * | 2002-01-22 | 2004-04-27 | Timothy J. Tremont | Method and apparatus to assist in orthognathic surgery |
-
2002
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- 2002-10-31 KR KR1020047006589A patent/KR20050042043A/en not_active Application Discontinuation
- 2002-10-31 CA CA002465102A patent/CA2465102A1/en not_active Abandoned
- 2002-10-31 KR KR1020097020198A patent/KR20090115884A/en not_active Application Discontinuation
- 2002-10-31 JP JP2003539552A patent/JP4328621B2/en not_active Expired - Fee Related
- 2002-10-31 EP EP02779961A patent/EP1449489A4/en not_active Withdrawn
- 2002-10-31 CN CNA028215397A patent/CN1578646A/en active Pending
- 2002-10-31 WO PCT/JP2002/011337 patent/WO2003037204A1/en active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005094718A1 (en) * | 2004-03-04 | 2005-10-13 | Marcello Marchesi | Method for generating and processing images for use in dentistry |
CN109310485A (en) * | 2016-06-21 | 2019-02-05 | 克利尔柯莱克特运营有限公司 | Orthodontic Treatment simulation with the improved graphics process for Dummy modeling |
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KR20050042043A (en) | 2005-05-04 |
US7292716B2 (en) | 2007-11-06 |
EP1449489A1 (en) | 2004-08-25 |
JP4328621B2 (en) | 2009-09-09 |
US20040259057A1 (en) | 2004-12-23 |
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JPWO2003037204A1 (en) | 2005-02-17 |
KR20090115884A (en) | 2009-11-09 |
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