title: Endodontic treatment of a mandibular first molar with three mesial canals and broken instrument removal.
abstract: To succeed in any dental procedure, the clinician's awareness of the patient's dental anatomy and its variations is crucial. In endodontic therapy, obtaining full information about the root canals' variations can affect the outcome substantially. This case report presents the endodontic treatment of a mandibular first molar exhibiting three mesial root canals with 4 mm of a separated K-file in the coronal third of the mesiolingual canal on an 18-year-old female patient. This case demonstrates the importance of locating additional canals in any roots undergoing endodontic treatment and how the clinician's awareness of aberrant internal anatomy may change the treatment results.
authors.affiliation: Department of Endodontics, Dental School, Shaheed Behesti University of Medical Sciences, Tehran, Iran.
authors.forename: Farhad
authors.initials: F
authors.lastname: Faramarzi
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Fakhri
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Fakri
authors.forename: Homan H
authors.initials: HH
authors.lastname: Javaheri
mesh_terms: D000293:Adolescent; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D020878:Device Removal; D004868:Equipment Failure; D005260:Female; D005547:Foreign Bodies / Q000628:therapy; D006801:Humans; D008334:Mandible; D008963:Molar; D012389:Root Canal Obturation; D018915:Root Canal Preparation / Q000295:instrumentation*; D014092:Tooth Root / Q000033:anatomy & histology*; D014465:Ultrasonics