Adjustment of tooth position in a virtual dental model

Patent metadata

Field	Value
Publication number	US-9414897-B2
Application number	US-201213477879-A
Country	US
Kind code	B2
Filing date	May 22, 2012
Priority date	May 22, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

The present disclosure provides computing device implemented methods, computing device readable media, and systems for adjustment of tooth position in a virtual dental model. Virtual dental modeling can include detecting space and/or collision between posterior teeth of an upper jaw and posterior teeth of a lower jaw in a virtual dental model that has been set in a preliminary target position. An energy function can be defined including the space and/or collision, tooth root movement, and align points. Weights can be assigned for each variable in the energy function. A position of the posterior teeth of the upper jaw and the posterior teeth of the lower jaw can be adjusted in six degrees of freedom to minimize the energy function. The detection, definition, assignment, and adjustment can be repeated until the energy function converges. The weights can be adjusted to reduce the space and/or collision.

First claim

What is claimed:

1. A computing device implemented method, comprising:
detecting space and/or collision between a number of posterior teeth of an upper jaw and a number of posterior teeth of a lower jaw in a virtual dental model that has been set in a preliminary target position;
defining an energy function including the space and/or collision, tooth root movement, and align points;
assigning weights for each variable in the energy function;
adjusting a position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw in six degrees of freedom to minimize the energy function;
repeating the detection, definition, assignment, and adjustment until the energy function converges;
adjusting the weights to reduce the space and/or collision;
defining a number of treatment steps between the preliminary target position and a final target position for each of the upper jaw and the lower jaw based on the converged energy function, wherein each of the number of treatment steps corresponds to an amount of adjustment to be performed by a respective orthodontic appliance; and
creating the respective orthodontic appliances.

2. The method of claim 1 , wherein the preliminary target position is manually defined by a user.

3. The method of claim 1 , wherein the preliminary target position is automatically defined by the computing device.

4. The method of claim 1 , wherein assigning weights includes more heavily weighting alignment for occlusion of anterior teeth and more heavily weighting contact and collision for the posterior teeth.

5. The method of claim 1 , wherein adjusting the position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw creates a stable solution for the energy function.

6. The method of claim 1 , wherein assigning weights for each variable in the energy function comprises:
setting a weight of collision as a first value for each iteration before a first number of iterations has been performed;
increasing the weight of collision by a second value for each iteration after the first number of iterations has been performed and before a second number of iterations has been performed; and
increasing the weight of collision by a third value for each iteration after the second number of iterations has been performed.

7. The method of claim 6 , wherein the method includes computing inter-proximal reduction after adjusting the position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw.

8. The method of claim 1 , wherein the method includes minimizing the energy function to compute a transformation of a particular tooth.

9. A computing device readable physical medium having instructions which can be executed by a processor to cause a computing device to:
detect space and/or collision between a number of posterior teeth of an upper jaw and a number of posterior teeth of a lower jaw in a virtual dental model that has been set in a preliminary target position;
define an energy function including the space and/or collision, tooth root movement, and align points;
assign weights for each variable in the energy function;
adjust a position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw in six degrees of freedom to minimize the energy function;
repeat the detection, definition, assignment, and adjustment until the energy function converges;
adjust the weights to reduce the space and/or collision;
define a number of treatment steps between the preliminary target position and a final target position for each of the upper jaw and the lower jaw based on the converged energy function, wherein each of the number of treatment steps corresponds to an amount of adjustment to be performed by a respective orthodontic appliance; and
create the respective orthodontic appliances.

10. The medium of claim 9 , including instructions to receive the preliminary target position from a user.

11. The medium of claim 9 , including instructions to define the preliminary target position.

12. The medium of claim 9 , wherein the instructions to assign weights include instructions to more heavily weight alignment for occlusion of anterior teeth and more heavily weight contact and collision for the posterior teeth.

13. The medium of claim 9 , wherein the instructions to adjust the position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw comprise instructions to create a stable solution for the energy function.

14. The medium of claim 9 , wherein the instructions to assign weights for each variable in the energy function comprise instructions to:
set a weight of collision as a first value for each iteration before a first number of iterations has been performed;
increase the weight of collision by a second value for each iteration after the first number of iterations has been performed and before a second number of iterations has been performed; and
increase the weight of collision by a third value for each iteration after the second number of iterations has been performed.

15. The medium of claim 14 , further including instructions to compute inter-proximal reduction after adjusting the position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw.

16. The medium of claim 9 , further including instructions to minimize the energy function to compute a transformation of a particular tooth.

17. A system for adjustment of tooth position in a virtual dental model, the system comprising a processor and memory configured to:
detect space and/or collision between a number of posterior teeth of an upper jaw and a number of posterior teeth of a lower jaw in a virtual dental model that has been set in a preliminary target position;
define an energy function including the space and/or collision, tooth root movement, and align points;
assign weights for each variable in the energy function;
adjust a position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw in six degrees of freedom to minimize the energy function;
repeat the detection, definition, assignment, and adjustment until the energy function converges;
adjust the weights to reduce the space and/or collision;
define a number of treatment steps between the preliminary target position and a final target position for each of the upper jaw and the lower jaw based on the converged energy function, wherein each of the number of treatment steps corresponds to an amount of adjustment to be performed by a respective orthodontic appliance; and
create the respective orthodontic appliances.

18. The system of claim 17 , wherein the preliminary target position is manually defined by a user.

19. The system of claim 17 , wherein the preliminary target position is automatically defined by the system.

20. The system of claim 17 , wherein the processor and memory are configured to assign weights by more heavily weighting alignment for occlusion of anterior teeth and more heavily weighting contact and collision for the posterior teeth.

21. The system of claim 17 , wherein the processor and memory being configured to adjust the position of the number of posterior teeth of the upper jaw and the number of posterior teeth of the lower jaw creates a stable solution for the energy function.

22. The system of claim 17 , wher

Assignees

• Wu Fuming
• Matov Vadim
• Borovinskih Artem
• Sterental Rene M
• Agapov Pavel
• Spiridonov Anton
• Boltunov Anatoliy
• Align Technology Inc

Inventors

• Wu Fuming
• Matov Vadim
• Borovinskih Artem
• Sterental Rene M
• Agapov Pavel
• Spiridonov Anton
• Boltunov Anatoliy

Classifications

• G16H20/00

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• G06T19/20

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• G06T2210/41

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