title: A mandibular first molar with five canals: report of case.
abstract: This report presents a case report and literature review that show the root canal system to be a variable entity and emphasize the need for the practitioner to perform a complete examination of the pulpal floor of the tooth even after the anticipated number of canal orifices is identified.
mesh_terms: D000328:Adult; D003786:Dental Pulp Cavity / Q000002:abnormalities* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008334:Mandible; D008963:Molar / Q000002:abnormalities* / Q000000981:diagnostic imaging; D011859:Radiography; D012390:Root Canal Therapy / Q000379:methods*