title: Unusual morphology of permanent tooth related to traumatic injury: a case report.
abstract: BACKGROUND
  Root duplication, or multiple roots, is a very rare anatomy of the maxillary central incisor.
  
  
  METHODS
  This case report describes a permanent central incisor having 2 distinct roots as an assumed sequela of the avulsion and replantation of a primary incisor.
  
  
  RESULTS
  The permanent successor might have had a disturbance of development because of the traumatic injury and discontinuity in the treatment after replantation. Conventional endodontic treatment followed by esthetic restoration was performed on the tooth.
  
  
  CONCLUSIONS
  Clinicians should consider the potential prognoses and complications of traumatic injuries to primary teeth.
authors.affiliation: Department of Conservative Dentistry, College of Dentistry, Yonsei University, Seoul, South Korea.
authors.forename: Minji
authors.initials: M
authors.lastname: Kang
authors.affiliation: Department of Conservative Dentistry, College of Dentistry, Yonsei University, Seoul, South Korea; Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, South Korea. Electronic address: andyendo@yuhs.ac.
authors.forename: Euiseong
authors.initials: E
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D003751:Dental Fistula / Q000175:diagnosis; D003790:Dental Pulp Necrosis / Q000175:diagnosis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000002:abnormalities* / Q000293:injuries; D010482:Periapical Abscess / Q000175:diagnosis; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D012390:Root Canal Therapy / Q000379:methods; D014084:Tooth Avulsion / Q000150:complications / Q000601:surgery; D014090:Tooth Replantation / Q000379:methods; D014092:Tooth Root / Q000002:abnormalities*; D014094:Tooth, Deciduous / Q000293:injuries
keywords: Maxillary central incisor; traumatic injury; unusual morphology