title: Management of the fused permanent upper lateral incisor: a case report.
abstract: BACKGROUND
  Fusion is the embryologic union of normally discrete structures. The treatment of this anomaly usually requires a multidisciplinary approach. Cone-beam computerized tomography (CBCT) is more common in dentistry and provides valuable information on fused teeth, allowing us to confirm its 3-dimensional structure and precise 3-dimensional cutting-plane line, which is very important to prevent pulp exposure in the conserved tooth.
  
  
  METHODS
  An 8-year-old boy presented with a permanent maxillary left lateral incisor fused with a supernumerary tooth. Hemisection was delayed until the pulp chamber separated. We used CBCT to decide the separation time and a precise 3-dimensional cutting plane line to avoid pulp exposure. The abnormally positioned lateral incisor and canine biologically moved to normal positions without orthodontic treatment.
  
  
  RESULTS
  At 1-year follow-up, there was no esthetic problem, hypersensitivity, periapical pathosis, or external resorption.
  
  
  CONCLUSIONS
  Hemisection could be selected as an appropriate treatment alternative and more recommended procedure in cases where a permanent tooth is fused with a supernumerary tooth.
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea.
authors.forename: Sun-Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Sung Chul
authors.initials: SC
authors.lastname: Choi
authors.forename: Youn-joo
authors.initials: YJ
authors.lastname: Chung
mesh_terms: D002648:Child; D054893:Cone-Beam Computed Tomography; D005671:Fused Teeth / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007180:Incisor / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D008297:Male; D008437:Maxilla; D014096:Tooth, Supernumerary / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery