Fig. 2
Schematic diagram of segmentation for crown, root, and tooth masks. A: Coronal plane; B: Sagittal plane; C: Axial plane; D: Initial three-dimensional image of tooth; E: Smoothened three-dimensional tooth model; SMT: Surface area of the whole tooth; SMR: Surface area of the root object; SMC: Surface area of the crown object; SS1: Truncation surface area; SR: Root surface area;