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Table 1 The number of roots and root canals 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 number Two root canals Three root canals Four root canals Five root canals Total
Two roots 53 619 219 3 894 (76.15%)
Three roots 0 44 231 5 280 (23.85%)
Total 53 (4.51%) 663 (56.47%) 450 (38.33%) 8 (0.68%) 1174 (100%)