S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Theses (Ph.D. / Sc.D._치의학과)
Clinical outcome of intentional replantatio of teeth
- 치과대학 치의학과
- Issue Date
- 서울대학교 대학원
- extraction technique; intentional replantation; orthodontic extrusion; success estimate; survival estimate
- 학위논문 (박사)-- 서울대학교 대학원 : 치의학과, 2014. 2. 조병훈.
- Aim: The aims of this retrospective study were to evaluate the clinical outcomes of intentional replantation (IR) of teeth in terms of tooth survival and periradicular healing and to investigate their prognostic factors.
Methodology: Two hundred and eighty-seven teeth treated by IR were analyzed retrospectively. Clinical outcomes between the cases with preoperative orthodontic extrusion for 2-3 week and those without extrusion were analyzed. The outcomes of IR were determined by clinical symptoms, tooth function, and radiographic evaluation. The probabilities of tooth survival and periradicular healing estimates were compared using Kaplan-Meier analysis. The contribution of a patient’s age and sex, tooth type and location, and preoperative orthodontic extrusion were 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. However, the success rate of IR was 83.2% for the teeth extracted without extrusion and 94.4% for those extracted with extrusion. The overall tooth 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. Among the variables tested, only the extraction technique with preoperative orthodontic extrusion significantly affected the survival rate (p =0.016). However, other prognostic variables, such as patient’s age and sex, tooth type and location did not affect the survival of intentionally replanted teeth.
Conclusions: IR can be a viable treatment option for teeth with previously failed nonsurgical root canal treatment, regardless of a patient’s age and sex, and tooth type and location. From this study, a preoperative orthodontic extrusion for 2-3 weeks before IR reduced root resorption and tooth fracture and would be recommended for successful IR.