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Table 2 The canal configuration based on Vertucci’s classification in the mandibular first molars

From: Prevalence of middle mesial canal and radix entomolaris of mandibular first permanent molars in a western Chinese population: an in vivo cone-beam computed tomographic study

Root Type I
(1)
Type II
(2–1)
Type III
(1–2-1)
Type IV
(2–2)
Type V
(1–2)
Type VI
(2–1-2)
Type VII
(1–2–1-2)
Type VIII
(3)
Mesial root 63 (5.37%) 235 (20.02%) 48 (4.09%) 773 (65.84%) 26 (2.21%) 8 (0.68%) 0 (0) 21 (1.79%)
Distal root 918 (78.19%) 41 (3.49%) 12 (1.02%) 180 (15.33%) 20 (1.70%) 3 (0.26%) 0 (0) 0 (0)