Incidence of missed middle mesial canal in endodontically treated mandibular molar teeth: A cone-beam computed tomography study.

Background: In endodontic treatment, the aim is to completely determine, shape, and fill all root canals in a three-dimensional way. Missed canals lead to treatment failure. In mandibular molars, there may be an extra canal called the middle mesial canal between the mesiobuccal and mesiolingual canals.