A retrospective survey of autotransplantation of teeth in dental clinics

The aim of this study was to investigate the usage of tooth autotransplantation in dental clinics which offer the treatment and evaluate its practicality. Participating dentists were requested to provide information on transplantations they had undertaken from 1 January 1990 to 31 December 2010. A total of 614 teeth from 552 patients (37 dentists) ranging in age from 17 to 79 (mean age: 44.1) were examined. Cumulative survival rate and mean survival time were calculated using the KaplanMeier method, and log rank test was used for analysis of factors. The mean number of autotransplantation patients per clinic per year was 1.4. Upper third molars constituted 36.8% of donor teeth, while 37.1% were lower third molars. The lower first molar region was the most common recipient site at 32.6%, followed by the lower second molar region (28.0%). Prosthodontic treatment of transplanted teeth involved coverage with a single crown (72.5%) and abutment of bridge (18.9%). A total of 102 transplanted teeth were lost owing to complications such as attachment loss (54.9%) and root resorption (25.7%). The cumulative survival rate in cases where donor teeth had complete root formation was 90.1% at 5 years, 70.5% at 10 years and 55.6% at 15 years. The mean survival time was 165.6 months. Older age was a significant risk factor (P < 0.05) for survival. In cases where suitable donor teeth are available, autotransplantation of teeth may be a plausible treatment option for dealing with missing teeth in dental clinics.