Method and system for incrementally moving teeth

• US 6,722,880 B2
• Filed: 01/14/2002
• Issued: 04/20/2004
• Est. Priority Date: 06/20/1997
• Status: Expired due to Term

• Current Assignee: Align Technology Incorporated
• Original Assignee: Align Technology Incorporated
• Inventors: Chishti, Muhammad, Wirth, Kelsey
• Primary Examiner(s): Wilson, John J.
• Application Number:
  US10/047,077
• Publication Number:
  US 20020064747A1
• Time in Patent Office: 827 Days
• Field of Search: 433/24, 433/213
• US Class Current: 433/24
• CPC Class Codes: A61C 2007/004 Automatic construction of a set of axes for a tooth or a plurality of teeth
• CPC Class Codes: A61C 7/00 Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
• CPC Class Codes: A61C 7/002 Orthodontic computer assisted systems
• CPC Class Codes: A61C 7/08 Mouthpiece-type retainers or positioners, e.g. for both the lower and upper arch arch-shaped medicament applicators for teeth or gums A61C19/063; mouthguards for protecting the teeth of sportsmen A63B71/085
• CPC Class Codes: A61C 9/00 Impression cups, i.e. impression trays; Impression methods computer-assisted sizing A61C13/0004; instruments for determining occlusion A61C19/05
• CPC Class Codes: A61C 9/0046 Data acquisition means or methods
• CPC Class Codes: B33Y 50/00 Data acquisition or data processing for additive manufacturing
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G06T 17/10 Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
• CPC Class Codes: G06T 2210/41 Medical

Abstract

A system for repositioning teeth comprises a plurality of individual appliances. The appliances are configured to be placed successively on the patient'"'"'s teeth and to incrementally reposition the teeth from an initial tooth arrangement, through a plurality of intermediate tooth arrangements, and to a final tooth arrangement. The system of appliances is usually configured at the outset of treatment so that the patient may progress through treatment without the need to have the treating professional perform each successive step in the procedure.

Claims

1. A method for making a predetermined series of dental incremental position adjustment appliances, said method comprising:

a) obtaining a digital data set representing an initial tooth arrangement;

b) obtaining a repositioned tooth arrangement based on the initial tooth arrangement;

c) obtaining a series of successive digital data sets representing a series of successive tooth arrangements; and

d) fabricating a predetermined series of dental incremental position adjustment appliances based on the series of successive digital data sets, wherein said appliances comprise polymeric shells having cavities shaped to receive and resiliently reposition teeth, and said appliances correspond to the series of successive tooth arrangements progressing from the initial to the repositioned tooth arrangement.

2. A method as in claim 1, wherein the step of obtaining an initial digital data set representing an initial tooth arrangement comprises scanning a three-dimensional model of a patient'"'"'s teeth.

3. A method as in claim 1, wherein the step of obtaining a digital data set representing a repositioned tooth arrangement comprises:

defining boundaries about at least some of the individual teeth; and

moving at least some of the tooth boundaries relative to the other teeth in an image based on the digital data set to produce the repositioned data set.

4. A method as in claim 1, wherein the step of obtaining space of successive digital data sets comprises determining positional differences between the initial data set and the repositioned date set and interpolating said differences.

5. A method as in claim 4, wherein the interpolating step comprises linear interpolation.

6. A method as in claim 4, wherein the interpolating step comprises non-linear interpolation.

7. A method as in claim 4, further comprising defining one or more key frames between the initial tooth arrangement and final tooth arrangement and interpolating between the key frames.

8. A method as in claim 1, wherein the fabricating step comprises:

controlling a fabrication machine based on the series of digital data sets to produce a series of positive models of the series of tooth arrangements; and

producing the dental appliances as a negative of the positive models.

9. A method as in claim 8 wherein the controlling step comprises:

providing a volume of non-hardened polymeric resin; and

selectively hardening the resin to produce the positive mold.

10. A method as in claim 9, wherein the producing step comprises molding the appliances over the positive models.

11. A method as in claim 1, wherein the fabricating step comprises:

controlling a fabrication machine to selective harden a portion of a non-hardened polymeric resin to directly produce the appliances.

12. A method for making a system to reposition teeth, comprising:

a) obtaining an initial digital data set representing an initial tooth arrangement;

b) obtaining a series of successive digital data sets based on the initial digital data set, wherein the series of successive digital data sets represents a series of successive tooth arrangements progressing from the initial tooth arrangement to a repositioned tooth arrangement; and

c) fabricating a predetermined series of dental incremental position adjustment appliances for incrementally repositioning teeth based on the series of successive digital data sets, and wherein said appliances comprise polymeric shells having cavities shaped to receive and resiliently reposition teeth.

13. A method as in claim 12, wherein the step of obtaining a initial digital data set representing an initial tooth arrangement comprises scanning a three-dimensional model of a patient'"'"'s teeth.

14. A method as in claim 12, wherein the step of obtaining a series of successive digital date sets comprises determining positions differences between the initial data set and a repositioned data set represent the repositioned tooth arrangement and interpolating said differences.

15. A method as in claim 14, wherein the interpolating step comprises linear interpolation.

16. A method as in claim 14 wherein the interpolating step comprises non-linear interpolation.

17. A method as in claim 14, further comprising defining one or more key frames between the initial tooth arrangement and final tooth arrangement and interpolating between the key frames.

18. A method as in claim 12, wherein the fabricating step comprises:

controlling a fabrication machine based on the series of digital data sets to produce a series positive models of the series of tooth arrangements; and

producing the dental appliances as a negative of the positive models.

19. A method as in claim 18 wherein the controlling step comprises:

providing a volume of non-hardened polymeric resin; and

scanning a laser to selectively harden the resin in a shape based on the digital data set to produce the positive models.

20. A method as in claim 18, wherein the producing step comprises molding the appliances over the positive models.

21. A method as in claim 12, wherein the fabricating step comprises:

controlling a fabrication machine to selective harden a portion of a non-hardened polymeric resin to directly produce the appliances.