Figure 1.

Cone-beam computed tomography images demonstrate: (a) Cases of mandibular bilateral first molars with two roots and two canals in axial section. (b) Case of mandibular right second molar with three root and mesiolingual root. Note that distal root fused with buccal part of mesial root (c) Case of mandibular right second molar with two roots. Note that distal root fused with buccal part of mesial root. (d) Distolingual roots can be seen concurrently in the first molars bilaterally. (e) Cases of mandibular left second molar with mesiobuccal 2-distobuccal 2 roots. (f) Cases of mandibular right second molar with four roots and left second molar with two roots- two canals. (g) Cases of mandibular right second molar with mesiobuccal 2-distolingual 2 roots. (h) Cases of bilateral mandibular first molars with five-canal and three roots. (i,j) Cases of bilateral mandibular first and second molars with C-shaped canals.