title: Conventional and surgical endodontic retreatment of a maxillary first molar: unusual anatomy.
abstract: The prognosis for endodontic treatment in teeth exhibiting a complex anatomy is unfavorable if clinicians fail to recognize extra root canals. This case demonstrates the presence of a second canal in the disto-buccal root of a maxillary right first molar. Conventional retreatment followed by endodontic surgery was performed and a 1-year postoperative radiograph shows apparent periapical healing.
authors.affiliation: Department of Endodontics, University of Pennsylvania, School of Dental Medicine, Philadelphia, Pennsylvania 19104, USA.
authors.forename: I-Ping
authors.initials: IP
authors.lastname: Chen
authors.forename: Bekir
authors.initials: B
authors.lastname: Karabucak
mesh_terms: D000328:Adult; D001047:Apicoectomy; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008437:Maxilla; D008963:Molar / Q000033:anatomy & histology; D010482:Periapical Abscess / Q000000981:diagnostic imaging / Q000601:surgery / Q000628:therapy*; D011859:Radiography; D019233:Retreatment; D012184:Retrograde Obturation; D012390:Root Canal Therapy / Q000379:methods*