SYSTEM AND METHOD FOR POSITIONING THREE-DIMENSIONAL BRACKETS ON TEETH

• US 20180104022A1
• Filed: 12/14/2017
• Published: 04/19/2018
• Est. Priority Date: 10/20/2006
• Status: Active Grant

• Current Assignee: Align Technology Incorporated
• Original Assignee: Align Technology Incorporated
• Inventors: Cheang, Ka Man
• Granted Patent: US 10,022,204 B2
• Time in Patent Office: Days
• 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 7/002 Orthodontic computer assisted systems
• CPC Class Codes: A61C 7/146 Positioning or placement of brackets; Tools therefor
• CPC Class Codes: G06T 17/20 Finite element generation, e.g. wire-frame surface description, tesselation
• CPC Class Codes: G06T 19/20 Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
• CPC Class Codes: G06T 2219/2004 Aligning objects, relative positioning of parts
• CPC Class Codes: G06T 2219/2021 Shape modification

Abstract

System and methods for positioning 3D virtual brackets on teeth for the precise positioning of conventional brackets and wire. Various reference features may be calculated for the teeth and used to calculate a position for the virtual bracket. Reference features that are calculated include curve of Spee, Andrew'"'"'s plane, and a facial axis of the clinical crown for the teeth.

Claims

1. A method for positioning virtual brackets on a virtual representation of a patient'"'"'s teeth, the method comprising:

receiving an electronic representation of the patient'"'"'s teeth;

outputting the virtual representation of the patient'"'"'s teeth to a display;

determining facial axis points of the patient'"'"'s teeth from the received electronic representation of the patient'"'"'s teeth;

determining a reference plane relative to the received electronic representation of the patient'"'"'s teeth for aligning virtual brackets on the virtual representation of the patient'"'"'s teeth;

outputting, with the display, the reference plane relative to the virtual representation of the patient'"'"'s teeth;

outputting, with the display, control points relative to the reference plane, wherein the control points are manipulable by a user;

locating suitable sites for placement of virtual brackets on the virtual representation of the patient'"'"'s teeth based on at least the determined facial axis points of the patient'"'"'s teeth; and

outputting, with the display, the virtual brackets on the virtual representation of the patient'"'"'s teeth in an initial position, the virtual brackets aligned on the virtual representation of the patient'"'"'s teeth according to the reference plane.

2. The method of claim 1, further comprising, receiving user input via at least one of the control points to manipulate the control point.

3. The method of claim 2, further comprising:

modifying the reference plane relative to the virtual representation of the patient'"'"'s teeth to form a modified reference plan; and

after modifying the reference plane, outputting, with the display, the reference plane relative to the virtual representation of the patient'"'"'s teeth.

4. The method of claim 1, further comprising, prior to outputting the virtual brackets on the virtual representation of the patient'"'"'s teeth, receiving a user selection of a virtual bracket type from a library of virtual brackets;

and wherein virtual bracket base contours of the user selected virtual bracket type are defined.

5. The method of claim 4, wherein outputting the virtual brackets on the virtual representation of the patient'"'"'s teeth comprises aligning virtual brackets with respective sites and calculating a final bracket fitting for each virtual bracket based at least on the virtual bracket base contour of the respective virtual bracket, wherein the final bracket fitting for each virtual bracket avoids collision of each virtual bracket and respective patient'"'"'s teeth.

6. The method of claim 1, further comprising calculating angulation and inclination statistics of the positioned virtual brackets using the reference plane.

7. The method of claim 1, wherein the reference plane is created from an ideally treated case associated with the electronic representation of the patient'"'"'s teeth.

8. The method of claim 1, further comprising:

displaying a wire extending through the virtual brackets;

receiving user input comprising at least one of a user modification of a position of a virtual tooth of the displayed virtual representation of the patient'"'"'s teeth or a user modification of a position of an outputted virtual bracket; and

updating the display of the displayed wire in response to the user input.

9. The method of claim 1, wherein determining the reference plane comprises receiving a user selection of the reference plane.

10. The method of claim 1, wherein the reference plane comprises Andrew'"'"'s plane or the curve of Spee.

11. The method of claim 1, further comprising finalizing positions of the virtual brackets on the virtual representation of the patient'"'"'s teeth and outputting instructions for fabricating a dental template to facilitate positioning of real brackets on the patient'"'"'s teeth.

12. The method of claim 1, further comprising modifying the initial position of the virtual bracket on the patient'"'"'s tooth in response to input from a user.

13. The method of claim 12, wherein modifying the initial position of the virtual bracket comprises one or more of:

restricting the virtual bracket to move on a surface of the patient'"'"'s tooth or restricting the virtual bracket to move along the reference feature.

14. The method of claim 12, further comprising testing for a collision of the virtual bracket with a tooth.

15. The method of claim 1, wherein the digital data set represents the patient'"'"'s teeth in a target arrangement.

16. A method comprising:

receiving an electronic representation of the patient'"'"'s teeth;

outputting the virtual representation of the patient'"'"'s teeth to a display;

determining an anatomic reference plane relative to the received electronic representation of the patient'"'"'s teeth for aligning virtual brackets on the virtual representation of the patient'"'"'s teeth, the anatomic reference plane being defined in part by points on the patient'"'"'s teeth;

displaying the anatomic reference plane to the display;

displaying control points for modifying the anatomic reference plane;

outputting, with the display, the virtual brackets on the virtual representation of the patient'"'"'s teeth, the outputted virtual brackets aligned on the virtual representation of the patient'"'"'s teeth according to the anatomic reference plane;

finalizing positions of the virtual brackets on the virtual representation of the patient'"'"'s teeth; and

outputting instructions for fabricating a dental template to facilitate positioning of real brackets on the patient'"'"'s teeth according to the finalized positions of the virtual brackets on the virtual representation of the patient'"'"'s teeth.

17. The method of claim 16, further comprising receiving a user input to at least one of the control points for modifying a shape of the anatomic reference plane, wherein the user input is received through user manipulation of one or more displayed control points.

18. The method of claim 16, wherein:

the virtual representation of the patient'"'"'s teeth includes a virtual representation of the patient'"'"'s gingival tissue; and

the finalized positions of the virtual brackets on the virtual representation of the patient'"'"'s teeth accounts for collisions between the virtual brackets and the virtual representation of the patient'"'"'s teeth and gingival tissue.

19. A system for positioning a virtual bracket on a virtual representation of a patient'"'"'s tooth, the system comprising:

a processor; and

memory comprising program code that, when executed by the processor, causes the system to;

receive an electronic representation of the patient'"'"'s tooth;

output the virtual representation of the patient'"'"'s tooth to a display;

determine a reference point of the patient'"'"'s tooth from the received electronic representation of the patient'"'"'s tooth;

determine a reference plane relative to the received electronic representation of the patient'"'"'s tooth for aligning the virtual bracket on the virtual representation of the patient'"'"'s tooth;

output the reference plane on the display;

output control points for the reference plane on the display;

receive a user input for modifying the reference plane via the control points;

modify a shape of the reference plane based on the user input via the control points;

locate a suitable site for placement of the virtual bracket on the virtual representation of the patient'"'"'s tooth based on at least the determined reference point of the patient'"'"'s tooth;

output, with the display, the virtual bracket on the virtual representation of the patient'"'"'s tooth, the outputted virtual bracket aligned on the virtual representation of the patient'"'"'s tooth based on at least the modified reference plane;

finalize a position of the virtual bracket on the virtual representation of the patient'"'"'s tooth; and

output instructions for fabricating a dental template to facilitate positioning of a real bracket on the patient'"'"'s tooth according to the finalized position of the virtual bracket on the virtual representation of the patient'"'"'s tooth.

20. The system of claim 19, wherein the reference point comprises a facial axis point of the patient'"'"'s tooth.