Systems and methods for designing and manufacturing an orthodontic appliance

Patent metadata

Field	Value
Publication number	US-12197186-B2
Application number	US-202017126632-A
Country	US
Kind code	B2
Filing date	Dec 18, 2020
Priority date	Oct 23, 2018
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

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, the trimline including:
(i) a first tooth curve associated with a first model tooth,
(ii) a second tooth curve associated with a second model tooth, and
(iii) a connector curve in an interproximal region in the 3-D digital model and connecting the first tooth curve to the second tooth curve,

wherein placing the margin point includes placing a first margin point of the plurality of margin points defining a first location on the first tooth curve and placing a second margin point of the plurality of margin points defining a second location on the second tooth curve;
adding at least one control point on the connector curve to define a location on the connector curve between the first margin point and the second margin point;
generating machine code from the trimline for a corresponding aligner;
using the machine code to control a trimming process of a machine to produce the aligner having an edge correlating to the trimline.

2. The method of claim 1 wherein during placing, at least one margin point of the plurality of margin points is placed at a gingival-occlusal height of a gingival zenith of the gingival margin of at least one tooth.

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

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

5. The method of claim 4 further including adding a vector on the trimline between the at least one control point and the first margin point, wherein the vector is configured to alter the curvature of the spline.

6. The method of claim 5 wherein the spline is a Bèzier curve.

7. The method of claim 1 further including moving the at least one control point occlusally relative to the first margin point and the second margin point and wherein the trimline follows the at least one control point.

8. The method of claim 7 wherein the at least one control point is in the interproximal region.

9. The method of claim 7 wherein, following moving the at least one control point, validating the trimline between the first margin point and the second margin point, including through the at least one control point, against at least one predetermined parameter.

10. The method of claim 9 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.

11. The method of claim 9 wherein after validating, determining that the trimline is invalid.

12. The method of claim 11 wherein after determining, moving at least one of the at least one control point, the first margin point, and the second margin point or a combination thereof and repeating validating.

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

14. The method of claim 1 further including moving the at least one control point relative to the margin point.

15. 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 plurality of margin points, the trimline including
(i) a first tooth curve associated with a first model tooth,
(ii) a second tooth curve associated with a second model tooth, and
(iii) a connector curve in an interproximal region in the 3-D digital model and connecting the first tooth curve to the second tooth curve,

wherein a first margin point of the plurality of margin points defines a first location on the first tooth curve and a second margin point of the plurality of margin points defines a second location on the second tooth curve;
add at least one control point on the connector curve to define a location on the connector curve between the first margin point and the second margin point;
generate machine code from the trimline for a corresponding aligner;
use the machine code to control a trimming process of a machine to produce the aligner having an edge correlating to the trimline.

16. The system of claim 15 wherein during placement, at least one margin point of the plurality of margin points is placed at a gingival-occlusal height of a gingival zenith of the gingival margin of at least one tooth.

17. The system of claim 15 wherein the first model tooth in the 3-D digital model cooperates with the modeled gingiva to define a line around the first model tooth and wherein the connector curve is connected to the first tooth curve at a transition point, the first tooth curve being defined in at least one of curvature or location by the line around the first model tooth and passing through the first margin point.

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

19. The system of claim 18 wherein the processor is configured by the program code to:
add a vector on the trimline between the at least one control point and the first margin point, wherein the vector is configured to alter the curvature of the spline.

20. The system of claim 18 wherein the spline is a Bèzier curve.

21. The system of claim 15 wherein the processor is configured by the program code to:
move the at least one control point occlusally relative to the first margin point and the second margin point and wherein the trimline follows the at least one control point.

22. The system of claim 21 wherein the processor is configured by the program code to:
validate the trimline against at least one predetermined parameter after moving the at least one control point.

23. The system of claim 22 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.

24. The system of claim 21 wherein the processor is configured by the program code to:
indicate that the trimline is invalid after validating.

25. The system of claim 15 wherein the processor is configured by the program code to:
move all the margin points occlusally or gingivally by a margin parameter.

26. The system of claim 15 further including a manufacturing system in which the machine code is usable to form the edge of the aligner.

27. The system of claim 15 wherein the processor is configured by the program code

Assignees

• Ormco Corp

Inventors

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

Classifications

• G06T2219/2004

  Aligning objects, relative positioning of parts · CPC title

• G06T2210/41

  Medical · CPC title

• G06T19/20

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

• G05B2219/49004

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

• G05B2219/35134

  3-D cad-cam · CPC title