Fig. 3

Color-coded 3D distribution of dentin thickness. Color-coded 3D distribution of dentin thickness between internal canal surface to external root surface in coronal 2/3 of the mandibular incisors on different surface before (pre-) and after root canal preparation (post-) were visualized. (A1, B1, C1, D1) represent the general view of the thickness distribution from 45° view. The thickness distribution of root 2/3 on the buccal root surface (A2, B2, C2, D2), the lingual root surface (A3, B3, C3, D3), and the proximal root surface (A4, B4, C4, D4). Pre-: Pre-operative model. Post-: Post-operative model