Identification of areas of interest during intraoral scans

1. A method of detecting tooth wear during orthodontic treatment, comprising:

receiving a first virtual three-dimensional (3D) model comprising one or more teeth of a patient, wherein the first virtual 3D model is based on a first intraoral scan of the patient taken at a first time;

receiving a second virtual 3D model comprising the one or more teeth of the patient, wherein the second virtual 3D model is based on a second intraoral scan of the patient taken at a second time;

comparing, by a processing device, the first virtual 3D model to the second virtual 3D model;

determining, as a result of the comparing, a first difference between the first virtual 3D model and the second virtual 3D model at a first dental site comprising a first tooth of the one or more teeth;

determining whether the first difference comprises a first type of change to the first tooth that is indicative of tooth wear or a second type of change to the first tooth that is indicative of tooth movement; and

responsive to determining that the first difference comprises the first type of change to the first tooth that is indicative of tooth wear, generating a first indicator of the tooth wear for the first tooth.

2. The method of claim 1 , further comprising:

determining a path of a missing portion of the first tooth; and

generating a contour comprising the path of the missing portion of the first tooth, wherein the first indicator comprises the contour.

3. The method of claim 1 , wherein comparing the first virtual 3D model to the second virtual 3D model comprises determining an alignment between the first virtual 3D model and the second virtual 3D model based on geometric features shared by the first virtual 3D model and the second virtual 3D model.

4. The method of claim 1 , further comprising determining a first intraoral area of interest comprising the first dental site, wherein determining the first intraoral area of interest comprises:

identifying a plurality of voxels in the second virtual 3D model that satisfy a first criterion;

determining a subset of the plurality of voxels that are proximate to one another; and

grouping the subset of the plurality of voxels into a volume.

5. The method of claim 4 , wherein the first indicator comprises a flag that points to the first intraoral area of interest, wherein the first intraoral area of interest is hidden in one or more views of the one or more teeth, and wherein the flag is visible in the one or more views.

6. The method of claim 1 , further comprising:

determining a first intraoral area of interest comprising the first dental site; and

determining an importance rank for the first intraoral area of interest based on the tooth wear.

7. The method of claim 1 , further comprising:

responsive to determining that the first difference comprises the second type of change to the first tooth that is indicative of tooth movement, generating a second indicator.

8. The method of claim 1 , further comprising:

determining that the first difference satisfies a first criterion;

determining that the first difference comprises a change to the first tooth that is indicative of tooth wear based on the first difference satisfying the first criterion; and

generating the first indicator for the first tooth.

9. The method of claim 8 , further comprising:

determining, as a result of the comparing, a second difference between the first virtual 3D model and the second virtual 3D model at a second dental site comprising a second tooth of the one or more teeth;

determining that the second difference satisfies a second criterion;

determining that the second difference comprises the second type of change to the second tooth that is indicative of tooth movement; and

generating a second indicator for the second tooth.

10. The method of claim 1 , further comprising:

determining, as a result of the comparing, a second difference between the first virtual 3D model and the second virtual 3D model at a second dental site;

determining that the second difference satisfies a gum recession criterion;

determining that the second difference is indicative of gum recession; and

generating a second indicator associated with the gum recession.

11. A system comprising:

a memory; and

a processing device operatively coupled to the memory, the processing device to:

receive a first virtual three-dimensional (3D) model comprising one or more teeth of a patient, wherein the first virtual 3D model is based on a first intraoral scan of the patient taken at a first time;

receive a second virtual 3D model comprising the one or more teeth of the patient, wherein the second virtual 3D model is based on a second intraoral scan of the patient taken at a second time;

compare the first virtual 3D model to the second virtual 3D model;

determine, as a result of comparing the first virtual 3D model to the second virtual 3D model, a first difference between the first virtual 3D model and the second virtual 3D model at a first dental site comprising a first tooth of the one or more teeth;

determine whether the first difference comprises a first type of change to the first tooth that is indicative of tooth wear or a second type of change to the first tooth that is indicative of tooth movement; and

responsive to determining that the first difference comprises the first type of change to first the tooth that is indicative of tooth wear, generate a first indicator of the tooth wear for the first tooth.

12. The system of claim 11 , wherein the processing device is further to:

determine a path of a missing portion of the first tooth; and

generate a contour comprising the path of the missing portion of the first tooth, wherein the first indicator comprises the contour.

13. The system of claim 11 , wherein comparing the first virtual 3D model to the second virtual 3D model comprises determining an alignment between the first virtual 3D model and the second virtual 3D model based on geometric features shared by the first virtual 3D model and the second virtual 3D model.

14. The system of claim 11 , wherein the processing device is further to determine a first intraoral area of interest comprising the first dental site, wherein determining the first intraoral area of interest comprises:

identifying a plurality of voxels in the second virtual 3D model that satisfy a criterion;

determining a subset of the plurality of voxels that are proximate to one another; and

grouping the subset of the plurality of voxels into a volume.

15. The system of claim 14 , wherein the first indicator comprises a flag that points to the first intraoral area of interest, wherein the first intraoral area of interest is hidden in one or more views of the one or more teeth, and wherein the flag is visible in the one or more views.

16. The system of claim 11 , wherein the processing device is further to:

determine a first intraoral area of interest comprising the first dental site; and

determine an importance rank for the first intraoral area of interest based on the tooth wear.

17. The system of claim 11 , wherein the processing device is further to:

generate a second indicator responsive to determining that the first difference comprises the second type of change to the first tooth that is indicative of tooth movement.

18. The system of claim 11 , wherein the processing device is further to:

determine that the first difference satisfies a first criterion;

determine that the first difference comprises a change to the first tooth that is indicative of tooth wear based on the first difference satisfying the first criterion; and

generate the first indicator for the first tooth.

19. The system of claim 18 , wherein the processing device is further to:

determine, as a result of the comparing, a second difference between the first virtual 3D model and the second virtual 3D model at a second dental site comprising a second tooth of the one or more teeth;

determine that the second difference satisfies a second criterion;

determine that the second difference comprises the second type of change to the second tooth that is indicative of tooth movement; and

generate a second indicator for the second tooth.

20. The system of claim 11 , wherein the processing device is further to:

determine, as a result of the comparing, a second difference between the first virtual 3D model and the second virtual 3D model at a second dental site;

determine that the second difference satisfies a gum recession criterion;

determine that the second difference is indicative of gum recession; and

generate a second indicator associated with the gum recession.