Mandibular left first premolar with three roots and three canals: A case report

Figure 1 Vertucci classification.

Figure 2 Panoramic radiograph.

Figure 3 Cone-beam computed tomography views of tooth 34 (orange arrows). A: From buccal to lingual; B: From the occlusal surface to the apical region; C: From mesial to distal.

Figure 4 Views of the tooth 34 surfaces. A: Mesial; B: Buccal; C: Distal; D: Lingual; E: Occlusal; F: Apical (a: Buccal root; b: Mesiolingual root; c: Distolingual root); G: Illustration of the buccal, mesiolingual, and distolingual root canals.