title: Root-canal treatment of a trifid crown premolar.
abstract: OBJECTIVE
  To describe successful root-canal treatment of a permanent maxillary first premolar with unusual anatomy.
  
  
  CONCLUSIONS
  A diagnosis of irreversible pulpitis of a geminated first premolar was made. Clinical and radiographic examination revealed a tooth with a trifid crown that joined to give the appearance of a single root at the cementoenamel junction. Root-canal treatment involved three separate access openings and treating four canals, three of which joined to exit through a common foramen.
  
  
  CONCLUSIONS
  Symptomatic teeth with morphological aberrations can be saved by root-canal treatment. Careful clinical and radiographic evaluation are essential, as treatment must be modified to address the unusual complexities of the root-canal system(s).
authors.affiliation: Department of Endodontics, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada. nahmias@endoweb.com
authors.forename: Y
authors.initials: Y
authors.lastname: Nahmias
authors.forename: M E
authors.initials: ME
authors.lastname: Rampado
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000002:abnormalities* / Q000000981:diagnostic imaging; D003786:Dental Pulp Cavity / Q000002:abnormalities; D005260:Female; D005500:Follow-Up Studies; D005671:Fused Teeth / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D008437:Maxilla; D010485:Periapical Periodontitis / Q000000981:diagnostic imaging / Q000628:therapy; D011671:Pulpitis / Q000000981:diagnostic imaging / Q000628:therapy*; D011859:Radiography; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D012390:Root Canal Therapy; D019228:Tooth Crown / Q000002:abnormalities* / Q000000981:diagnostic imaging