WO2005107628A1 - Mise en place de brackets orthodontiques - Google Patents

Mise en place de brackets orthodontiques Download PDF

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Publication number
WO2005107628A1
WO2005107628A1 PCT/AU2005/000679 AU2005000679W WO2005107628A1 WO 2005107628 A1 WO2005107628 A1 WO 2005107628A1 AU 2005000679 W AU2005000679 W AU 2005000679W WO 2005107628 A1 WO2005107628 A1 WO 2005107628A1
Authority
WO
WIPO (PCT)
Prior art keywords
tooth
bracket
pad
optimum position
desired final
Prior art date
Application number
PCT/AU2005/000679
Other languages
English (en)
Inventor
David Hynd
Geoffrey Hall
Original Assignee
E-Brackets Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by E-Brackets Pty Ltd filed Critical E-Brackets Pty Ltd
Publication of WO2005107628A1 publication Critical patent/WO2005107628A1/fr

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Classifications

    • 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
    • A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
    • A61C7/14—Brackets; Fixing brackets to teeth
    • A61C7/146—Positioning or placement of brackets; Tools therefor

Definitions

  • the present invention relates broadly to a method for accurate placement of orthodontic brackets together with configurable bracket pads used in the placement and attachment of orthodontic brackets.
  • Orthodontic treatment for the manipulation of tooth position, rotation and orientation often involves the use of brackets indirectly or directly bonded to teeth, and an archwire connected to the brackets.
  • the archwire is elastically deformed when initially installed on the brackets.
  • the resiliency of the archwire to deformation causes the brackets attached to the teeth to be subject to rotational and/or translational force, thereby moving the teeth over time to a desired final tooth position.
  • the design (prescription) of the slots in the bracket also produce a torqueing force on the tooth (that is, a rotational force along an axis perpendicular to the length and breadth of the tooth).
  • brackets on teeth are an important step. Incorrect placement of brackets can result in movement of teeth in undesired directions, requiring subsequent correction. Conventionally, correct bracket placement is difficult or impossible where the tooth to which the bracket is to be attached is severely maloccluded (ie an adjacent or opposing tooth is blocking the placement of the bracket in the desired position on the tooth).
  • a method for placement of an orthodontic bracket on a tooth comprising the steps of: obtaining a digital three-dimensional representation of the tooth; calculating a desired final tooth position for the tooth from the digital representation; and calculating an optimum position on the tooth for an orthodontic bracket using the desired final tooth position.
  • a method for placement of an orthodontic bracket on a replica of a tooth comprising the steps of: obtaining a digital three-dimensional representation of the tooth or the replica of the tooth; calculating a desired final tooth position for the tooth from the digital representation; calculating an optimum position on the tooth for an orthodontic bracket using the desired final tooth position; attaching a configurable bracket pad to a pad-facing side of the bracket; and placing the bracket on the replica of the tooth in a position on the replica corresponding to the optimum position.
  • the method also comprises the step of designing the configurable bracket pad having a bracket-facing surface and an opposing tooth-facing surface being shaped to conform to the surface of the tooth a the optimum position.
  • the step of placing the bracket on the replica of the tooth includes instructing or programming a robot to effect this placement step.
  • a method for determining an optimum position for placement of a configurable bracket pad on the surface of a tooth comprising the steps of: obtaining a digital three-dimensional representation of the tooth; calculating a desired final tooth position for the tooth from the digital representation; and calculating an optimum position on the tooth for the bracket pad using the desired final tooth position.
  • a configurable bracket pad being adapted for placement on a tooth or a replica of a tooth at an optimum position , calculated from a desired final position for the tooth derived from a three-dimensional representation of the tooth, said bracket pad having a tooth-facing surface being shaped to conform to the surface of the tooth at the optimum position.
  • Figure 1 depicts the current technology limitation of prior art orthodontic brackets in which the base of the bracket is required to be perpendicular to the archwire in the final tooth position.
  • Figure 2 depicts an application of the preferred embodi ent of the present invention in which the configurable bracket pad of the preferred embodiment enables the bracket to be placed anywhere on the tooth surface
  • Figure 3 depicts the current technology limitation of prior art orthodontic brackets in which a bracket cannot be placed on the centreline of maloccluded teeth.
  • Figure 4 depicts an application of the preferred embodiment of the present invention in which pff-ccntrc bracket positioning enables maloccluded teeth to be rotated in one step.
  • the invention in its preferred embodiment is primarily directed to facilitating the optimum position of orthodontic brackets in an automated, cost-effective and time-effective manner.
  • a method for placement of an orthodontic bracket on a tooth comprising the steps of; obtaining a digital three-dimensional representation of the tooth; calculating a desired final tooth position for the tooth from the digital representation; and calculating an optimum position on the tooth for an orthodontic bracket using the desired final tooth position.
  • the method also comprises the step of designing a configurable bracket pad for attaching to a pad-facing side of the bracket, the pad having a bracket-facing surface an an opposing tooth-facing surface, wherein the tooth-facing surface of the pad is shaped to conform to a surface of the tooth at the optimum position.
  • the configurable bracket pad enables the bracket lo be placed in the oplimum position in relation to the teeth, providing significantly more flexibility in the positioning of the bracket.
  • the method according to the first aspect further comprises the step of attaching the configurable bracket pad lo the pad-facing side of the bracket. It is also preferable that the method further comprises placing the bracket in the optimum position on the tooth.
  • Obtaining a three-dimensional digital representation of the tooth This step is usually achieved by taking a mould or impression of the patient's teeth (generally of the teeth in a single jaw) and filling that mould with a plaster or stone- like substance that will harden within the mould to form a cast. Once the cast has hardened, the mould is removed. The cast takes the form of the patient's teeth and comprises replicas of each of the patient's teeth. The cast is then scanned in three dimensions using a laser or Computer Aided Tomography (CAT) scanner. Software is then utilised to produce a three- dimensional, digital representation of the teeth to be treated.
  • CAT Computer Aided Tomography
  • a high quality impression is made (most usually from a polyvinylsiloxanc material) it is possible to directly scan the impression using a CAT scanner. In this case it is not necessary to make a cast.
  • the final positions r the teeth are estimated by the treating orthodontist, cither by a manual means of by means of a computer. Errors in the estimation process require adjustments as treatment progresses, resulting in lengthy treatment times.
  • the final tooth position is automatically calculated by means of a computer.
  • the tooth in its post-treatment or final position is displayed on a display means (for example a computer monitor or printer) for verification.
  • a display means for example a computer monitor or printer
  • modification of the final position of any tooth may affect the final position of one or a number of other teeth.
  • the operator is able to manually adjust the computer-calculated position of the teeth to obtain this adjusted desired final tooth position.
  • the desired tooth position automatically calculated by means of a computer is manually adjusted by an operator.
  • the required movements of each tooth to reach its final position are calculated. From the results of this calculation, the magnitude and direction of the force required to be applied to the tooth is calculated.
  • the optimum position of the bracket is calculated. In a preferred embodiment, the optimum position for placement of the bracket is calculated by means of a computer.
  • the optimum position for the bracket is constrained by at least the following factors:
  • the archwire must remain in intimate contact with the bracket; and (c) the bracket must be able to be positioned on the tooth - that is, there must be sufficient clearance above the surface of the tooth to enable the bracket to be installed and not interfere with other teeth.
  • brackets conventionally have a specific base curvature.
  • the specific curvature of the base of the brackets means that that a bracket will only tit snugly on a relatively small area of a tooth, generally around the centre line of the tooth (the centre line bisecting the breadth of the tooth and running from the gum line to the tooth tip).
  • brackets have not been able to be installed in the optimum position on the tooth, and accordingly alterations of the archwire and/or brackets have needed to be made during treatment.
  • the preferred embodiment of the present invention involves the use of a configurable bracket pad on the base of the bracket to alleviate the aforementioned constraints.
  • the configurable bracket pad can be of any height, and has its bottom surface moulded to the surface of the tooth at the optimum placement position. This greatly increases the area of the surface of the tooth on which the bracket is able to be placed.
  • bracket cannot be placed on the centreline of the tooth, it wil I have lo be replaced on the tooth a number of times during treatment in order lo achieve the desired final tooth position.
  • the bracket may be placed anywhere on the toolh surface, as shown in Figure 2, including in an optimum position offset from the centre line of the tooth.
  • the advantages of this flexibility are most clearly demonslraled in relation to maloccluded teeth, where a bracket cannot be placed on the centreline of the tooth. Conventionally, bracket placement is impossible, as shown in Figure 3.
  • the preferred embodiment of the present invention allows correct rotation of maloccluded teeth in one step, as shown in Fi ure 4.
  • the brackets must be positioned on the patient's teeth.
  • the brackets may be placed on a replica of the teeth (for example a cast) by means of a robot, and subsequently joined by an archwire.
  • the optimum bracket position is calculated from the original scan of the patient's teeth.
  • the computer uses its calculations of the optimum bracket position to instruct a robot to place the brackets on the replica or cast in a position on the replica or cast corresponding to the optimum position on the teeth.
  • brackets are connected by an archwire to fo i an orthodontic appliance. This appliance is removed from the replica and placed in the patient's mouth. 'Ilie brackets of the appliance arc thereby placed in an optimum position in relation to the patient's teeth.
  • orthodontic bracket and configurable bracket pad may be made of any suitable material, .
  • the configurable bracket pad may be shaped by casting, moulding or by a grinding process. All such variations and modifications are to be considered within the scope of the present invention, the nature of which is to be determined from the foregoing description.

Abstract

L'invention concerne un procédé de mise en place d'un bracket orthodontique sur une dent. Ce procédé comprend les étapes consistant à obtenir une représentation tridimensionnelle numérique de la dent ; à calculer une position finale désirée pour la dent à partir de la représentation numérique ; et à calculer une position optimale sur la dent pour un bracket orthodontique au moyen de la position finale désirée de la dent. La mise en place d'un bracket orthodontique sur une dent est facilité au moyen d'un tampon de bracket adapté.
PCT/AU2005/000679 2004-05-12 2005-05-12 Mise en place de brackets orthodontiques WO2005107628A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57007704P 2004-05-12 2004-05-12
US60/570,077 2004-05-12

Publications (1)

Publication Number Publication Date
WO2005107628A1 true WO2005107628A1 (fr) 2005-11-17

Family

ID=35320010

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2005/000679 WO2005107628A1 (fr) 2004-05-12 2005-05-12 Mise en place de brackets orthodontiques

Country Status (1)

Country Link
WO (1) WO2005107628A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015025255A3 (fr) * 2013-08-20 2015-05-28 Universidad Nacional De Colombia Appareil orthodontique pour placer, positionner, et ajuster des brackets sur la surface vestibulaire de la dent

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5683243A (en) * 1992-11-09 1997-11-04 Ormco Corporation Custom orthodontic appliance forming apparatus
US20030096209A1 (en) * 2001-11-09 2003-05-22 Raymond Sugiyama Orthodontic braces for specialized patients
US20030152884A1 (en) * 2002-02-13 2003-08-14 Dirk Wiechmann Modular system for customized orthodontic appliances
US20030163291A1 (en) * 2002-02-22 2003-08-28 3M Innovative Properties Company Selection of orthodontic brackets
US6632089B2 (en) * 1999-11-30 2003-10-14 Orametrix, Inc. Orthodontic treatment planning with user-specified simulation of tooth movement
US6682346B2 (en) * 1997-06-20 2004-01-27 Align Technology, Inc. Defining tooth-moving appliances computationally
US20040029078A1 (en) * 2002-01-22 2004-02-12 Marshall Michael Craig Method and apparatus using a scanned image for marking bracket locations
US20040166462A1 (en) * 2003-02-26 2004-08-26 Align Technology, Inc. Systems and methods for fabricating a dental template
US20040175670A1 (en) * 2002-01-29 2004-09-09 Cadent Ltd. Method and system for assisting in applying an orthodontic treatment
US20040175669A1 (en) * 2003-03-04 2004-09-09 Norbert Abels Custom-fitted orthodontic bracket manufactured by computerized and selective removal of portions of a bracket

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5683243A (en) * 1992-11-09 1997-11-04 Ormco Corporation Custom orthodontic appliance forming apparatus
US6616444B2 (en) * 1992-11-09 2003-09-09 Ormco Corporation Custom orthodontic appliance forming method and apparatus
US6682346B2 (en) * 1997-06-20 2004-01-27 Align Technology, Inc. Defining tooth-moving appliances computationally
US6632089B2 (en) * 1999-11-30 2003-10-14 Orametrix, Inc. Orthodontic treatment planning with user-specified simulation of tooth movement
US20030096209A1 (en) * 2001-11-09 2003-05-22 Raymond Sugiyama Orthodontic braces for specialized patients
US20040029078A1 (en) * 2002-01-22 2004-02-12 Marshall Michael Craig Method and apparatus using a scanned image for marking bracket locations
US20040175670A1 (en) * 2002-01-29 2004-09-09 Cadent Ltd. Method and system for assisting in applying an orthodontic treatment
US20030152884A1 (en) * 2002-02-13 2003-08-14 Dirk Wiechmann Modular system for customized orthodontic appliances
US20030163291A1 (en) * 2002-02-22 2003-08-28 3M Innovative Properties Company Selection of orthodontic brackets
US20040166462A1 (en) * 2003-02-26 2004-08-26 Align Technology, Inc. Systems and methods for fabricating a dental template
US20040175669A1 (en) * 2003-03-04 2004-09-09 Norbert Abels Custom-fitted orthodontic bracket manufactured by computerized and selective removal of portions of a bracket

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015025255A3 (fr) * 2013-08-20 2015-05-28 Universidad Nacional De Colombia Appareil orthodontique pour placer, positionner, et ajuster des brackets sur la surface vestibulaire de la dent

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