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1. WO2020136241 - 3D SEGMENTATION FOR MANDIBLE AND MAXILLA

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A method for registering a 3D mesh and a 3D volume image of a patient’s teeth comprising:

a) obtaining a 3D volume image of the patient's teeth in an occlusion position, the 3D volume image containing at least one jaw portion;

b) generating contour surface content corresponding to at least one of lingual and vestibular surfaces of the teeth from the 3D volume image; c) providing a registered 3D mesh in an occlusion position, the registered mesh comprising at least a portion of a maxillary jaw and a mandibulary jaw , each of the jaws comprising at least one of the vestibular and lingual surfaces;

d) registering the registered 3D mesh with the generated contour surface content.

2. A method for registering a 3D mesh and a 3D volume image of a patient’s teeth further comprising at least one of displaying , storing, transmitting the registered 3D mesh with the 3D volume image.

3. The method of claim 1 wherein the 3D volume image is obtained from a computed tomography apparatus.

4. The method of claim 1 wherein providing the registered 3D mesh comprises :

- obtaining a first 3D mesh comprising at least a portion of the maxillary jaw, the first 3D mesh comprising at least a vestibular part and a lingual part;

- obtaining a second 3D mesh comprising at least a portion of the mandibular jaw, the second 3D mesh comprising at least a vestibular part and a lingual part;

- registering the first 3D mesh with the second 3D mesh in an occlusion position to form the registered 3D mesh.

5. The method of claim 4 wherein at least one of the first and second 3D meshes are obtained using an intraoral scanner.

6 The method of claim 1 further comprising the step of identifying a volume of interest including at least one jaw portion from content of the 3D volume image.

7. The method according to claim 1 wherein the registered 3D mesh is segmented.

8. The method of any of preceding claims further comprising segmenting the mandibular jaw or the maxillary jaw of the 3D volume image based on registration step d).

9. The method according to any of the preceding claims, further comprising the step of defining a first set of continuous curves corresponding to tooth position on the 3D volume image.

10. The method according to claim 8 wherein the generated contour surface content corresponding to at least one of either lingual or vestibular surfaces of the teeth is generated based on the first set of continuous curves.

11. The method according to claim 1 further comprising defining a second set of continuous curves for the registered 3D mesh.

12. The method according to claim 10 further comprising extracting a lingual or vestibular portion of the registered 3D mesh based on the second set of continuous curves.

13. The method according to claim 9 to 12, wherein the continuous curves are parabolas.

14. The method according to claim 9 wherein defining one of the first and second set of continuous curves comprises defining a set of parallel curves.

15. The method according to claim 1 wherein registering the registered 3D mesh with the generated contour surface content comprises a first registration based on the first and second set of curves and a second registration based on the vestibular or lingual surfaces.