Figure 1.

Cone-beam computed tomography (CBCT) imaging of study patients analyzed using OnDemand 3D software. (a) Reconstructed panoramic view with nerve tracing in permanent mandibular first molars (PM1) areas. Red lines indicate positions of the mandibular canals on this panoramic view. The green line (noted P01) indicates the first measurement point on the cross-sectional view of this PM1 in the ED group; (b) Cross-sectional CBCT image displaying measurement point P08. M–C refers to the distance from the most inferior margin of the mandible to the center of the mandibular canal. L–C refers to the distance from the outer margin of the lingual cortex to the center of the mandibular canal. A red circle indicates the mandibular canal.