Tooth shading, transparency and glazing

A method of color matching a dental restoration for a tooth of a patient, the method comprising:

• receiving or generating a three-dimensional (3D) model of the tooth, the 3D model including a plurality of voxels forming an internal structure corresponding to a region between an outer enamel surface of the tooth and an outer surface of dentine, wherein the dimensions of the region are based on a scan of the tooth or of a tooth that is complementary to the tooth;
• setting each voxel of the plurality of voxels to one or more starting optical property values;
• and
• iteratively adjusting the starting optical property value for each voxel based on one or more optical property values measured from the scan corresponding to a plurality locations and angles of a camera taking the scan relative to the tooth or the tooth that is complementary to the tooth, until the adjusted optical properties converge to a value within an acceptable range of the one or more optical property values measured from the scan.

A non-transitory computer readable medium storing instructions for execution by a processor that, when executed, cause the processor to perform a method comprising:

• receiving or generating a three-dimensional (3D) model of a tooth, the 3D model including a plurality of voxels forming an internal structure corresponding to a region between an outer enamel surface of the tooth and an outer surface of dentine, wherein the dimensions of the region are based on a scan of the tooth or of a tooth that is complementary to the tooth;
• setting each voxel of the plurality of voxels to one or more starting optical property values;
• and
• iteratively adjusting the starting optical property value for each voxel based on one or more optical property values measured from the scan corresponding to a plurality locations and angles of a camera taking the scan relative to the tooth or the tooth that is complementary to the tooth, until the adjusted optical properties converge to a value within an acceptable range of the one or more optical property values measured from the scan.