Granted Patent B2

US 7,245,750 · App. 10/350,304 · Granted Jul 17, 2007

Abstract

Claims (38)

1. A computer implemented method of automatic determination of locations of individual teeth within an electronic model image of teeth of a patient to enable manipulation of the electronic model image by end users, the method comprising:

determining possible horizontal cut lines within a horizontal plane cut through the electronic model image corresponding to possible separation lines between the teeth;

determining possible vertical cut lines within a vertical plane cut through the electronic model image corresponding to possible separation lines between the teeth; and

automatically determining locations of individual teeth using the possible horizontal cut lines and the possible vertical cut lines.

2. The method according to claim 1 wherein the method further comprises:

obtaining the electronic model image by scanning a physical impression of the teeth of the patient;

determining a model base element corresponding to a registration base that is part of the physical impression of the teeth of the patient; and

cutting the electronic model image into a set of electronic model teeth images configured to be further manipulated by a user.

3. The method according to claim 2 , wherein the horizontal plane cut through the electronic model image is located parallel to the model base element and is also located between the model base element and the top of the teeth.

4. The method according to claim 3 , wherein the possible horizontal cut lines are located at locations where a minimum horizontal local separation distance is found for electronic model image data when measured relative to the two sides of the image data.

5. The method according to claim 4 , wherein the minimum horizontal local separation distance is found for electronic model image data when the horizontal local minimum is below a specified separation distance.

6. The method according to claim 4 , wherein the minimum horizontal local separation distance is found for electronic model image data when the horizontal local minimum is below a specified separation distance.

7. The method according to claim 2 , wherein the vertical plane cut through the electronic model image is located perpendicular to the model base element and is also located along a parabolic arc through the teeth.

8. The method according to claim 7 , wherein the possible vertical cut lines are located at locations where a vertical local minimum is found for electronic model image data when measured relative to the model base element.

9. The method according to claim 7 , wherein the possible vertical cut lines are located at locations where a vertical local minimum is found for electronic model image data when measured relative to the model base element.

10. The method according to claim 8 , wherein the vertical local minimum is found for electronic model image data when the vertical local minimum is below a specified threshold.

11. The method according to claim 8 , wherein the vertical local minimum is found for electronic model image data when the vertical local minimum is below a specified threshold.

12. The method according to claim 2 , wherein the method further comprises identifying regions of electronic image data where teeth have not been found;

identifying possible teeth separation cut lines within the identified regions;

ranking the possible teeth separation cut lines; and

using the rankings of possible separation cut lines to identify teeth.

13. The method according to claim 12 , further comprising continuing to search the regions of electronic image data where teeth have not been found until the number of identified teeth is greater than a specified number of teeth.

14. The method according to claim 12 , further comprising continuing to search the regions of electronic image data where teeth have not been found until the number of identified teeth is greater than a specified number of teeth.

15. The method according to claim 2 , wherein the vertical plane cut through the electronic model image is located perpendicular to the model base element and is also located along a parabolic arc through the teeth.

16. The method according to claim 2 , wherein the method further comprises identifying regions of electronic image data where teeth have not been found;

identifying possible teeth separation cut lines within the identified regions;

ranking the possible teeth separation cut lines; and

using the rankings of possible separation cut lines to identify teeth.

17. A computer program data product embedded in a computer readable medium for a computing system to implement a method of automatic determination of location of individual teeth within an electronic model image of teeth of a patient to enable manipulation of the electronic model image by end users, the method comprising:

determining possible horizontal cut lines within a horizontal plane cut through the electronic model image corresponding to possible separation lines between the teeth;

determining possible vertical cut lines within a vertical plane cut through the electronic model image corresponding to possible separation lines between the teeth; and

automatically determining locations of individual teeth using the possible horizontal cut lines and the possible vertical cut lines.

18. The computer program data product according to claim 17 , wherein the method further comprises:

obtaining the electronic model image by scanning a physical impression of the teeth of the patient;

determining a model base element corresponding to a registration base that is part of the physical impression of the teeth of the patient; and

cutting the electronic model image into a set of electronic model teeth images configured to be further manipulated by a user.

19. The computer program data product according to claim 18 , wherein the horizontal plane cut through the electronic model image is located parallel to the model base element and is also located between the model base element and the top of the teeth.

20. The computer program data product according to claim 19 , wherein the possible horizontal cut lines are located at locations where a minimum horizontal local separation distance is found for electronic model image data when measured relative to the two sides of the image data.

Assignments (8)