Fig. 2.

CBCT images of maxillary teeth. R – Right. a Axial slice of maxillary central and lateral incisors and canines displaying single canals (b) Axial slice of a three-rooted left maxillary first premolar displaying one canal in each root. c Axial slice of a right maxillary second premolar displaying two canals (d) Axial slice of a left maxillary second premolar displaying two canals. e Axial slice of a right maxillary first molar displaying a second mesiobuccal (MB2) canal in its mesial root. f Axial slice of a left maxillary first molar displaying a second mesiobuccal (MB2) canal in its mesial root. g Sagittal slice of a right maxillary first molar displaying a second palatal canal. h Axial slice of a right maxillary second molar displaying a second mesiobuccal (MB2) canal in its mesial root. i Axial slice of a left maxillary second molar displaying a second mesiobuccal (MB2) canal in its mesial root