title: Importance of third mesial canals in mandibular molars: report of 2 cases.
abstract: Most mandibular first molars have 2 mesial canals. Two cases of failed endodontically treated first mandibular molars are presented with 2 obturated mesial canals. The cases were retreated with a third mesial canal identified, and instrumented and obturated with resolution of the patients' signs and symptoms. These cases show that consideration must be made to recognize the possibility of a third mesial canal and perform complete treatment to minimize the possibility of failure.
authors.affiliation: Kornberg School of Dentistry, Temple University, Philadelphia, PA 19140, USA.
authors.forename: Cemil
authors.initials: C
authors.lastname: Yesilsoy
authors.forename: Omar
authors.initials: O
authors.lastname: Porras
authors.forename: Wanda
authors.initials: W
authors.lastname: Gordon
mesh_terms: D000328:Adult; D003786:Dental Pulp Cavity / Q000473:pathology*; D003790:Dental Pulp Necrosis / Q000628:therapy; D005260:Female; D006801:Humans; D008963:Molar / Q000473:pathology*; D010485:Periapical Periodontitis / Q000628:therapy; D019233:Retreatment; D012390:Root Canal Therapy / Q000379:methods*; D017211:Treatment Failure; D016896:Treatment Outcome