title: Clinical outcome of intentional replantation with preoperative orthodontic extrusion: a retrospective study.
abstract: OBJECTIVE
  To evaluate retrospectively the clinical outcomes of intentional replantation (IR) of teeth in terms of tooth survival and periradicular healing and to investigate their prognostic factors.
  
  
  METHODS
  Two hundred and eighty-seven teeth treated by IR were analysed retrospectively. Clinical outcomes between the cases with preoperative orthodontic extrusion for 2-3 week and those without extrusion were analysed. The outcomes of IR were determined by clinical and radiographic evaluation. Tooth survival and periradicular healing estimates were compared using Kaplan-Meier analysis. The contribution of a patient's age and gender, tooth type and location, and preoperative orthodontic extrusion was investigated using the multivariate Cox proportional hazard model.
  
  
  RESULTS
  The mean follow-up period was 25.4 ± 9.3 months. The overall success rate of IR was 89.5% based on periradicular healing. The overall survival rate was 95.1%. The survival rates were 91.2% for the teeth extracted without extrusion and 98.1% for those extracted with extrusion. Amongst the variables tested, only the extraction technique with preoperative orthodontic extrusion significantly affected the survival rate (P = 0.016). Other prognostic variables, such as age and gender, tooth type and location, did not affect the survival of intentionally replanted teeth.
  
  
  CONCLUSIONS
  Intentional replantation was a viable treatment option for teeth with previously failed nonsurgical root canal treatment, regardless of a patient's age and gender, and tooth type and location. Preoperative orthodontic extrusion for 2-3 weeks reduced root resorption and tooth fracture and can be recommended to enhance the outcome of IR.
authors: Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea; Department of Conservative Dentistry, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Korea.
authors: Y H
authors: YH
authors: Choi
authors: J H
authors: JH
authors: Bae
authors: Y K
authors: YK
authors: Kim
authors: H Y
authors: HY
authors: Kim
authors: S K
authors: SK
authors: Kim
authors: B H
authors: BH
authors: Cho
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009970:Orthodontics; D011300:Preoperative Care; D012189:Retrospective Studies; D014090:Tooth Replantation; D016896:Treatment Outcome; D055815:Young Adult
keywords: extraction technique; intentional replantation; orthodontic extrusion; success estimate; survival estimate