[Screening and analysis of prognostic factors of repairing single missing tooth by autotransplantation of teeth].

To screen and analyze the factors affecting the prognosis of replacing single missing tooth by autograft tooth, so as to provide reference for clinical judgment of surgical prognosis. A total of 176 patients (188 teeth) underwent autotransplantation of teeth in the Department of Oral & Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical University from January 2017 to December 2019, including 85 teeth of males and 103 teeth of females were involved. The age was (33.0±9.8) years (16-65 years). The possible factors affecting the prognosis of replacing single missing tooth by autograft tooth were summarized and grouped, and the clinical and imaging data were recorded and judged. The surgical records and photographic data from the patients' previous medical records were retrospectively analyzed. The survival analysis method was used for statistical analysis to screen out the factors affecting the cumulative survival rate of transplanted teeth. The 5-year cumulative survival rate of 188 transplanted teeth was 88.4%. Univariate Log-Rank analysis showed that age (<0.001), sex (=0.008), smoking (<0.001), position of recipient area (0.001), height of alveolar bone in recipient area (0.001), time of donor tooth (0.001), use of donor model (0.001) and initial stability (0.001) were significantly correlated with cumulative survival rate of transplanted teeth. Multivariate Cox proportional hazard regression analysis showed that smoking (β=-2.812, 0.049), alveolar bone height (β=1.521, 0.020), donor time (β=-2.001, 0.019), use of donor model (β=1.666, 0.034) and initial stability (β=-1.417, 0.033) were significantly correlated with the cumulative survival rate of transplanted teeth. The prognosis of autogenous tooth transplantation can be predicted by smoking, height of alveolar bone in recipient area, time of donor teeth , use of donor model and initial stability. Good prognosis of transplanted teeth can be obtained by using donor model during operation, reducing the time of donor teeth , taking effective methods to restore alveolar bone height, maintaining good initial stability, and good oral health education after operation.