Fig. 5

CBCT images of mandibular teeth. a Axial slice of a right mandibular first molar displaying a middle mesial canal in its mesial root. b Axial slice of a left mandibular first molar displaying a middle mesial canal in its mesial root. c Axial slice of a right mandibular first molar displaying a second distal canal in its distal root. d Axial slice of a left mandibular first molar displaying a second distal canal in its distal root. e Axial slice of a right mandibular first molar displaying an extra distolingual root (radix entomolaris). f Axial slice of a left mandibular first molar displaying an extra distolingual root (radix entomolaris). g Axial slice of a right mandibular second molar displaying a C-shaped canal. h Axial slice of a left mandibular second molar displaying a C-shaped canal