title: Autotransplantation of 28 premolar donor teeth in 24 orthodontic patients.
abstract: OBJECTIVE
  To test the null hypothesis that premolar autotransplantation is not successful for orthodontic patients.
  
  
  METHODS
  In the present study, 28 premolar transplants from 24 orthodontic patients were associated with orthodontic treatment. At a routine 3-month appointment, patients underwent a dental radiograph and a chair-side observation for periodontal problems. Three sets of dental radiographs were taken by one dental assistant using a custom holder at: preoperation (T0), 2 year postoperation (T1), and retention (T2) (4- to 14-year follow-up observation) stages. All transplants were conducted in a one-phase operation by one operator (Dr Inoue). Recipient sites were: ten for missing maxillary canines, nine for maxillary centrals and laterals, eight for lower second premolar, and five for other missing premolar sites. All recipients maintained the retained primary tooth with a socket.
  
  
  RESULTS
  The success ratio of all 28 transplants was 100%, although four transplants shorter than a 4-year period of observation were omitted. Two transplant patients, one with a medical history of histiocytosis and the other with a history of osteomyelitis of the maxilla without a recipient socket, were also excluded from this study. Eleven of 22 premolar transplants had a root canal treatment (RCT), four of which had RCT within 2 years after the operation.
  
  
  CONCLUSIONS
  The null hypothesis was rejected. The success ratio of premolar transplants was 100%.
authors.affiliation: Graduate School (Unit of Orthodontics) and Institute for Oral Science, Matsumoto Dental University School of Dentistry, Nagano, Japan.
authors.forename: Tadasu
authors.initials: T
authors.lastname: Tanaka
authors.forename: Toshio
authors.initials: T
authors.lastname: Deguchi
authors.forename: Toru
authors.initials: T
authors.lastname: Kageyama
authors.forename: Ryuzo
authors.initials: R
authors.lastname: Kanomi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Inoue
authors.forename: Kelvin W C
authors.initials: KW
authors.lastname: Foong
mesh_terms: D000293:Adolescent; D000848:Anodontia / Q000601:surgery*; D001641:Bicuspid / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000637:transplantation*; D002648:Child; D003481:Cuspid / Q000002:abnormalities; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000002:abnormalities; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D009811:Odontometry; D010510:Periodontal Diseases / Q000209:etiology; D011183:Postoperative Complications; D011859:Radiography; D012390:Root Canal Therapy; D012391:Root Resorption / Q000209:etiology; D020254:Tooth Ankylosis / Q000209:etiology; D014092:Tooth Root / Q000000981:diagnostic imaging; D014182:Transplantation, Autologous; D016896:Treatment Outcome