WO2012008566A1

WO2012008566A1 - Dental model

Info

Publication number: WO2012008566A1
Application number: PCT/JP2011/066192
Authority: WO
Inventors: 慎史三栗; 正人岸田; 俊光国保
Original assignee: 株式会社ニッシン
Priority date: 2010-07-16
Filing date: 2011-07-15
Publication date: 2012-01-19
Also published as: JPWO2012008566A1

Abstract

A dental model which enables whether or not or how the mandibular canal is damaged during training for drilling the jawbone to be accurately understood. A dental model (10) provided with a model jawbone and used for dental training is configured in such a manner that the model jawbone has formed therein a cavity (47) provided at a position corresponding to a part of or the entire mandibular canal. The cavity (47) preferably penetrates through to the surface (41) of the model jawbone, and a placement object (50) having a different color from the model jawbone is preferably disposed in the cavity (47). The placement object (50) preferably has different electrical conduction properties from the model jawbone.

Description

Dental model

The present invention relates to a dental model used for dental training.

In recent years, dentistry using artificial roots has been performed. An artificial tooth root is one in which an artificial tooth root is embedded in the jawbone of a defective portion of a permanent tooth and a denture is covered thereon, but a high technique is required for drilling the jawbone. That is, in order to embed an implant typified by an artificial tooth root, it is necessary to perform drilling at an accurate position to avoid destruction of surrounding tissues.

Therefore, a dental model used for training of drilling of the jawbone has been disclosed (see Patent Documents 1 to 4). These dental models have model jawbones that imitate the jawbone.

Japanese Utility Model Publication No. 6-25861 JP-A-10-33574 Japanese Patent Laid-Open No. 11-249548 JP 2001-120578 A

By the way, major accidents that can occur during perforation include damage to the inferior alveolar nerve of the branch of the mandibular nerve and the mandibular canal that is the passage of the same name arteriovenous. Conventionally, however, attention has been focused on improving the presence of perforation, and there have been contrivances such as selecting the material of the model jawbone so that it has a hardness approximating that of the jawbone. Not.

Here, for the purpose of simply improving the technique for avoiding damage to the mandibular canal, those skilled in the art will consider a cost-effective, rod-like object imitating the shape of the mandibular canal (appropriately approximating the hardness of the mandibular canal). It should be conceived that the model jaw bone is buried in the model jaw bone. In other words, unlike a sample model that should closely approximate a living body in any structure, in a dental model used for dental training, while emphasizing the maximization of the training effect, up to the part that does not contribute to the training effect. Those skilled in the art will recall that approximating a living body is only a waste of manufacturing costs.

However, the present inventors have found that in the above embodiment, it is difficult to accurately grasp whether or not the mandibular canal is damaged or not during training. For this reason, the said aspect is inadequate at the point which feeds back the effect of training, and is also a disorder | damage | failure when an instructor etc. recognizes the practical skill of an apprentice.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dental model that can accurately grasp the presence or absence of the mandibular canal in training of drilling the jawbone.

The present inventors have found that the arrival of the drilling tool can be grasped from the outside by forming a cavity in a part of the model jawbone corresponding to part or all of the mandibular canal and arranging an appropriate object in this cavity. The present invention has been completed. Specifically, the present invention provides the following.

(1) A dental model equipped with a model jawbone and used for dental training,
A dental model in which a cavity is formed in the model jawbone at a location corresponding to a part or all of the mandibular canal.

(2) The dental model according to (1), wherein the cavity penetrates to the surface of the model jawbone.

(3) The dental model according to (1) or (2), wherein a different color object different from the model jawbone is arranged in the cavity.

(4) The dental model according to any one of (1) to (3), wherein a different conductive material having conductivity different from that of the model jawbone is disposed in the cavity.

(5) The dental model according to (4), further comprising notifying means for notifying a change in an electrical parameter due to the excavation tool coming into contact with the different conductive material.

(6) The dental model according to any one of (1) to (5), wherein a linear member having flexibility is disposed in the cavity.

(7) The dental model according to any one of (1) to (6), wherein a member having a hardness higher than that of other parts of the model jawbone is disposed at least on the upper surface side of the model jawbone in the outer periphery of the cavity. .

According to the present invention, since a cavity is formed at a position corresponding to a part or all of the mandibular canal in the model jawbone, it is possible to grasp the arrival of the drilling tool from the outside by arranging an appropriate object in this cavity. can do. Accordingly, it is possible to accurately grasp whether or not the mandibular canal is damaged or not in the drilling of the jawbone.

It is the whole dental model perspective view concerning one embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II of the model jawbone in the dental model of FIG. 1. It is a figure which shows the usage method of the dental model of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to this embodiment.

FIG. 1 is an overall perspective view of a dental model 10 according to the first embodiment of the present invention. The dental model 10 includes a model jawbone 40 simulating a jawbone, and model teeth 20 having a shape approximate to the actual tooth shape are supported on the model jawbone 40. The dental model 10 shown in FIG. 1 has a structure corresponding to the entire lower jaw, but has at least a location necessary for drilling practice (that is, a location where a later-described molar 21 is to be supported). Good. In the present invention, the model tooth 20 is not an essential element.

The model tooth 20 of this embodiment is composed of an anterior tooth 23 and, if necessary, a molar. Each model tooth 20 includes a crown portion and a root portion, and the front teeth 23 and the molars are different from each other in shape. In the present embodiment, the molars are missing and the model jawbone 40 is exposed, and drilling training can be performed at this location. In addition, the number and location of the missing molar teeth are not particularly limited.

FIG. 2 is a cross-sectional view of the model jawbone 40 in the dental model 10, and FIG. 3 is a diagram showing how to use the dental model 10. A cavity 47 is formed in the model jaw bone 40 at a location corresponding to a part or the whole of the mandibular canal. A typical mandibular canal is a small branch that is fed from the inside of the bone facing the anterior and medial side of the mandibular hole to the roots of the large and premolars and the canine, under the alveoli of the mandibular body, almost parallel to the hyoid hyoid muscle line. Run forward and open to the face with a pit hole. Accordingly, the cavity 47 may extend downward and forward from the hole 48 corresponding to the mandibular hole of the model jawbone 40 and may be bent outward at the distal end 49 to the hole 46 as necessary. However, the cavity may be formed differently from that shown in FIG. 2 for the purpose of reducing the labor of forming the cavity or intentionally imitating an abnormal mandibular canal.

By arranging an appropriate arrangement 50 that can grasp the arrival of the drilling tool from the outside in the cavity 47, it is possible to accurately grasp whether or not the mandibular canal is damaged or not in the drilling of the jawbone. It is preferable that the cavity 47 penetrates to the surface of the model jawbone in that the user can easily arrange the arrangement 50. In the present embodiment, the cavity 47 penetrates to the surface of the model jawbone by a hole 48 formed in the inner side of the model jawbone 40.

The arrangement object 50 arranged in the cavity 47 may be any of a lump (having a certain shape-retaining property), a powder, and a liquid (having substantially no shape-retaining property), and is not particularly limited. However, it is preferable that it is a different color different color from the model jawbone 40. When the drilling tool accidentally reaches the cavity 47, the arrangement 50 scraped by the drilling tool is discharged to the surface of the model jawbone 40. In this case, the presence or absence of fragments of the scraped arrangement 50 is easily determined by the color difference. I can confirm. Although not particularly limited, since the model jawbone 40 (in particular, the surface 41 and the filler 43) is white or milky white, the different color material may be red, blue, black, or the like.

It is also preferable that the arrangement 50 is a different conductive material having a conductivity different from that of the model jawbone. When the drilling tool accidentally reaches the cavity 47, the conductivity of the member that contacts the drilling tool changes, so monitoring the associated phenomenon (typically a potential change) makes it easy to check the training results. it can. The material of the different conductivity material may be appropriately selected in relation to the material of the model jawbone, and may be either high conductivity or low conductivity. Although not particularly limited, generally, a thermosetting resin such as a model jawbone (particularly, the filler 43) (for example, phenol resin, melamine resin, urea resin, unsaturated polyester, epoxy resin, allyl resin, urethane resin) , Polyethylene, polypropylene, styrene butadiene resin, AAS resin, ACS resin, EVA resin, polyacetal, polycarbonate, cellulosic plastic and other thermoplastic resins) have low conductivity, so the material of the different conductive material is metal wire, etc. It can be highly conductive.

In such an embodiment, it is preferable that the dental model 10 further includes notification means for notifying a change in electrical parameter due to the excavation tool coming into contact with a different conductive material. Thereby, the result of training can be confirmed easily. Such informing means may utilize a conventionally known mechanism, and includes, for example, a conducting wire that electrically connects the excavation tool and the different conductive material, and further includes parameters related to the current passing through the conducting wire ( For example, a measuring instrument for measuring a current value or a voltage value, or a device (for example, a lamp or a speaker) that emits light, sound, or the like based on a change in current passing through a conducting wire or the like may be provided. Since these specific structures are conventionally well-known techniques, description thereof is omitted.

Arrangement 50 may be in any form as described above, but is preferably a linear member having flexibility. Since such a linear member has flexibility, it can be easily inserted into and removed from the bent cavity 47 before and after training, thereby more accurately grasping the result of training from the degree and location of external damage. Can do. The specific material is not particularly limited, and may be a conventionally known resin or the like.

Such an arrangement 50 preferably has an extending portion 51 that extends from the hole 48 to the outside in that it can be more easily inserted into and removed from the cavity 47. However, the present invention is not limited to this, and for example, the model jawbone 40 may be divided on the surface including the cavity 47, and the arrangement object 50 may be arranged or removed from the cavity 47 in a divided state.

In addition, the arrangement | positioning object 50 is not restricted to what is provided with any 1 type of the said aspect, You may provide it in combination of 2 or more types. Specifically, the arrangement 50 may be a linear member in which a highly conductive metal wire or the like is covered with a different color object (for example, a cylindrical resin) different from the model jawbone 40. The shaped member is flexible. In this case, the result of the training can be confirmed by the color difference and the phenomenon accompanying the change in conductivity, and the result of the training can be grasped more accurately from the degree and location of the external loss.

It is preferable that a hard member 45 having a hardness higher than that of the other portion of the model jawbone 40 (that is, the filler 43) is disposed on at least the upper surface (that is, the surface 41) side of the model jawbone 40 in the outer periphery of the cavity 47. . As a result, when the excavator reaches the vicinity of the hard member 45, the sensation felt by the practitioner changes in the same way as the operation in the living body, so that a sense of reality can be given to the practicum. The material of such a hard member 45 is not particularly limited, but is a thermosetting resin such as phenol resin, melamine resin, urea resin, unsaturated polyester, epoxy resin, allyl resin, or acrylic resin, ABS resin, AAS resin, ACS. Resin, polyamide, polycarbonate, polysulfone, polyphenylene oxide, polyphenylene sulfide, polyarylate, polyethylene terephthalate, polyimide, etc., combined with glass fiber, glass beads, quartz, calcium carbonate, etc. as a filler and reinforced composite resin Etc. The color of the hard member 45 is not particularly limited and may be the same color as the filler 43 or a different color, but is the same color from the viewpoint of improving the ability to detect changes in hardness (it cannot rely on the color of the visible debris). Is preferred.

As shown in FIG. 2, the hard member 45 of the present embodiment is disposed on the entire outer periphery of the cavity 47, but may be provided only on the upper surface (that is, the surface 41) side of the model jawbone 40. . Further, the hard member 45 of the present embodiment is disposed over the entire length of the cavity 47, but may be disposed only in a part of the cavity 47.

The method for using the dental model 10 will be described with reference to FIG. First, the arrangement object 50 is arranged in the cavity 47, and the excavation tool 90 is operated in this state, and the tip 91 is pushed down from the surface 41 to the filling material 43 (FIG. 3A). Eventually, tip 91 will reach the proper depth to implant the desired implant (FIG. 3B). At this stage, if the depression of the tip 91 can be completed, the practice is successful. Up to this point, the surface 41 scraped to the tip 91 and the fragments α of the filler 43 are discharged.

Here, when the practitioner misoperates and pushes the tip 91 further, the tip 91 reaches the hard member 45 (that is, the outer edge of the mandibular canal), and changes the sense of the practitioner. If the apprentice can detect this change, the further deterioration of the situation can be prevented by stopping the pushing of the tip 91.

However, if the practitioner cannot detect the abnormality and further pushes the tip 91, the tip 91 reaches the cavity 47 (that is, the nerve inside the mandibular canal), and the fragment β of the arrangement object 50 scraped to the tip 91 is formed. It will be discharged. Since the pieces β are different in color from the surface 41 and the pieces α, the presence of the pieces can be easily confirmed by the color difference. Moreover, when the excavator 90 and the arrangement | positioning object 50 are electrically connected and the means to alert | report the change of an electrical parameter is further used, it will alert | report.

After the excavation is completed in this way, implants are inserted as necessary, and the training is completed. Thereafter, the extended portion 51 is grasped and the arrangement 50 is collected from the cavity 47, and the degree and location of the external loss of the arrangement 50 are confirmed to determine whether or not the mandibular canal is damaged or not in the drilling of the jawbone. Accurately grasp.

The present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

DESCRIPTION OF SYMBOLS 10 Dental model 20 Model tooth 23 Anterior tooth 40 Model jaw bone 41 Surface 43 Filling material 45 Hard member 46 Hole 47 Cavity 48 Hole 49 Terminal 50 Arrangement 51 Extension part 90 Excavation tool 91 Tip alpha fragment β fragment

Claims

A dental model equipped with a model jawbone and used for dental training,
A dental model in which a cavity is formed in the model jawbone at a location corresponding to a part or all of the mandibular canal.
The dental model according to claim 1, wherein the cavity penetrates to the surface of the model jawbone.
The dental model according to claim 1 or 2, wherein a different color of a color different from that of the model jawbone is disposed in the cavity.
The dental model according to any one of claims 1 to 3, wherein a different conductive material having conductivity different from that of the model jawbone is disposed in the cavity.
The dental model according to claim 4, further comprising notification means for notifying a change in electrical parameter caused by a drilling tool coming into contact with the different conductive material.
The dental model according to any one of claims 1 to 5, wherein a linear member having flexibility is disposed in the cavity.
The dental model according to any one of claims 1 to 6, wherein a member having a hardness higher than that of other portions of the model jawbone is disposed at least on the upper surface side of the model jawbone in the outer periphery of the cavity.