title: Prognostic Factors for Clinical Outcomes in Autotransplantation of Teeth with Complete Root Formation: Survival Analysis for up to 12 Years.
abstract: BACKGROUND
  Tooth autotransplantation is a treatment option that has the potential to restore masticatory function and esthetics to edentulous spaces resulting from extracted teeth. The purpose of this study was to investigate the prognostic factors and clinical outcomes for autotransplanted teeth with complete root formation.
  
  
  METHODS
  Patients who had received tooth autotransplantation in the Department of Conservative Dentistry, Yonsei University Dental Hospital, Seoul, Korea, from July 2001 to August 2010 were electronically searched, and a total of 105 cases of autotransplanted teeth met the inclusion criteria. Tooth survival, inflammatory root resorption (IRR), ankylosis, and related prognostic factors were assessed by using the survival analysis that was based on clinical and radiographic examination.
  
  
  RESULTS
  The cumulative tooth survival rate was 68.2% at 12 years after the tooth autotransplantation. According to the Cox proportional hazard regression analysis, patient age, donor position, and extraoral time were significantly associated with tooth survival (P < .05). Donor extraction type was significantly associated with IRR (P < .05), and transplantation timing and initial stability were significantly associated with ankylosis (P < .05) CONCLUSIONS: Patients less than 45 years of age, maxillary donor teeth, and an extraoral time of less than 15 minutes were associated with significantly higher tooth survival. Surgical extraction of the donor tooth was associated with a significantly higher incidence of IRR. Immediate transplantation after the extraction of the recipient site's tooth and low initial stability were associated with a significantly lower incidence of ankylosis.
authors.affiliation: Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Youngjune
authors.initials: Y
authors.lastname: Jang
authors.affiliation: Department of Orthodontics, The Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Yoon Jeong
authors.initials: YJ
authors.lastname: Choi
authors.affiliation: Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Seung-Jong
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea.
authors.forename: Byoung-Duck
authors.initials: BD
authors.lastname: Roh
authors.affiliation: Department of Conservative Dentistry, Kyung Hee University Dental Hospital at Gangdong, Seoul, Korea.
authors.forename: Sang Hyuk
authors.initials: SH
authors.lastname: Park
authors.affiliation: Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea. Electronic address: andyendo@yuhs.ac.
authors.forename: Euiseong
authors.initials: E
authors.lastname: Kim
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019647:Oral Surgical Procedures / Q000009:adverse effects / Q000379:methods; D011379:Prognosis; D016019:Survival Analysis; D014057:Tomography, X-Ray Computed; D014070:Tooth / Q000000981:diagnostic imaging / Q000637:transplantation*; D014092:Tooth Root / Q000000981:diagnostic imaging / Q000637:transplantation*; D014182:Transplantation, Autologous; D017211:Treatment Failure; D016896:Treatment Outcome
keywords: Autotransplantation; computer-aided rapid prototyping model; extraoral time; periodontal ligament; survival analysis