Systems and methods for designing and manufacturing an orthodontic appliance

Patent metadata

Field	Value
Publication number	US-10935958-B2
Application number	US-201816168075-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Oct 23, 2018
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

Systems and methods of defining a trimline in relation to modeled teeth including modeled gingiva. The trimline is for use to manufacture an aligner. A margin point is placed proximate a gingival margin at each tooth on at least one jaw in the model. A trimline connects the plurality of margin points from which machine code is generated. The aligner manufactured includes an edge that correlates with the trimline according to the machine code. A margin point may be proximate a gingival zenith. At least one tooth cooperates with the modeled gingiva to define a line around the tooth. The trimline includes at least one tooth curve and at least one connector curve connected to the tooth curve at a transition point. At least one control point is on the trimline between two margin points. The trimline is defined by a spline that may be a Bèzier curve.

First claim

What is claimed is:

1. A computer-implemented method of defining a trimline for use in the manufacturing of an aligner, the method comprising:
receiving a 3-D digital model of a patient's teeth projecting from a modeled gingiva;
placing a margin point proximate a gingival margin at each tooth on at least one jaw in the 3-D digital model;
generating a trimline connecting the plurality of margin points;
adding at least one control point on the trimline between two margin points;
moving the at least one control point occlusally relative to the two margin points and wherein the trimline follows the control point;
following moving the at least one control point, validating the trimline between the two margin points, including through the at least one control point, against at least one predetermined parameter; and
generating machine code from the trimline for a corresponding aligner;
storing the machine code in a non-transitory medium for generating the trimline on the corresponding aligner,
wherein after validating, determining that the trimline is invalid and after determining that the trimline is invalid, visually indicating an invalid portion of the trimline relative to a visual indication of any valid portion of the trimline, and
wherein the at least one predetermined parameter includes one or more of a minimum clinical radius, a minimum tool radius, and a minimum labial-lingual distance.

2. The method of claim 1 further including manufacturing the aligner and wherein an edge of the aligner is configured to correlate with the trimline according to the machine code.

3. The method of claim 1 wherein during placing, at least one margin point is proximate a gingival zenith on at least one tooth.

4. The method of claim 1 wherein at least one tooth in the 3-D digital model cooperates with the modeled gingiva to define a line around the at least one tooth and wherein the trimline includes at least one tooth curve and at least one connector curve connected to the at least one tooth curve at a transition point, the tooth curve being defined in at least one of curvature and location by the line around the at least one tooth and passing through at least one margin point.

5. The method of claim 1 wherein the trimline is defined by a spline between at least one margin point of the two margin points and the at least one control point.

6. The method of claim 5 further including adding a vector on the trimline between the at least one control point and the at least one margin point, wherein the vector is configured to alter the curvature of the spline.

7. The method of claim 6 wherein the spline is a Bèzier curve.

8. The method of claim 1 wherein the control point is proximate an interproximal region between adjacent teeth.

9. The method of claim 1 wherein after determining, moving at least one of the at least one control point and one of the two margin points and repeating validating.

10. The method of claim 1 further including moving all of the margin points occlusally or gingivally by a margin parameter.

11. A system for defining a trimline for use in the manufacturing of an aligner, the system comprising:
a processor; and
non-transitory memory including program code; the processor configured by the program code to:
receive a 3-D digital model of a patient's teeth projecting from a modeled gingiva;
place a margin point proximate a gingival margin at each tooth on a jaw in the 3-D digital model;
generate a trimline connecting the margin points;
validate the trimline against at least one predetermined parameter after moving the at least one control point;
indicate that the trimline is invalid after validating;
change a color of an invalid portion of the trimline relative to a color of any valid portion of the trimline;
generate machine code from the trimline for a corresponding aligner; and
store the machine code in the memory for generating the trimline on the corresponding aligner.

12. The system of claim 11 wherein during placement, at least one margin point is placed proximate a gingival zenith on at least one tooth.

13. The system of claim 11 wherein at least one tooth in the 3-D digital model cooperates with the modeled gingiva to define a line around the at least one tooth and wherein the trimline includes at least one tooth curve and at least one connector curve connected to the at least one tooth curve at a transition point, the tooth curve being defined in at least one of curvature or location by the line around the at least one tooth and passing through at least one margin point.

14. The system of claim 11 wherein the processor is configured by the program code to:
place at least one control point on the trimline between two margin points.

15. The system of claim 14 wherein the processor is configured by the program code to:
define the trimline as a spline between at least one margin point of the two margin points and the at least one control point.

16. The system of claim 15 wherein the processor is configured by the program code to:
add a vector on the trimline between the at least one control point and one of the two margin points, wherein the vector is configured to alter the curvature of the spline.

17. The system of claim 15 wherein the spline is a Bèzier curve.

18. The system of claim 14 wherein the processor is configured by the program code to:
move the at least one control point occlusally relative to the two margin points and wherein the trimline follows the at least one control point.

19. The system of claim 11 wherein the at least one predetermined parameter includes one or more of a minimum clinical radius, a minimum tool radius, and a minimum labial-lingual distance.

20. The system of claim 11 wherein the processor is configured by the program code to:
move the margin points occlusally or gingivally by a margin parameter.

21. The system of claim 11 further including a manufacturing system in which the machine code is usable to form an edge of an aligner.

22. A computer-implemented method of defining a trimline for use in the manufacturing of an aligner, the method comprising:
receiving a 3-D digital model of a patient's teeth at one stage of treatment, the patient's teeth projecting from a modeled gingiva;
placing a margin point proximate a gingival margin at each tooth on at least one jaw in the 3-D digital model;
generating a trimline connecting the plurality of margin points, the trimline being for an aligner for use at the one stage of treatment;
following generating the trimline at the one stage of treatment, generating a second trimline for the patient's teeth at another stage of treatment in which at least one of the patient's teeth in the 3-D digital model is in a different position than at the one stage of treatment,
wherein generating the second trimline includes morphing the trimline at the one stage of treatment in accordance with a change in position of the at least one of the patient's teeth and corresponding margin point;
generating machine code from the second trimline; and
storing the machine code in a non-transitory medium for preparing the second trimline of an aligner for the another stage of treatment.

23. The method of claim 22 wherein at least one margin point is associated with one triangle in the 3-D model of teeth and morphing includes maintaining the association between the at least one margin point and the triangle from the 3-D model of the teeth to one

Assignees

• Ormco Corp

Inventors

• Sirovskiy Yevgeniy
• Borovinskih Artem
• Shah Mithil J
• Ankudinov Ilia

Classifications

• G06T19/20

  Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts · CPC title

• A61C7/08 Primary

  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 title

• G05B2219/49004

  Modeling, making, manufacturing model to control machine, cmm · CPC title

• G06T2210/41

  Medical · CPC title

• G05B2219/35134

  3-D cad-cam · CPC title