title: C-shaped canal configurations in mandibular molars.
abstract: Three cases of C-shaped mandibular second molars are described. These clinical findings were similar for each case:--It was impossible to diagnose the condition on the preoperative radiograph.--All three cases had normal anatomy of the pulp floor and separate canal orifices.--Continuous hemorrhage and sensitivity were encountered when instruments were used.
mesh_terms: D000328:Adult; D003786:Dental Pulp Cavity / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008963:Molar / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography