Risk factors affecting third molar autotransplantation in males: a retrospective survey in dental clinics

Abstract

The aim of this study was to investigate the risk factors affecting long-term prognosis of autotransplantation of third molars with complete root formation in males at dental clinics. Participating dentists were requested to provide information on transplantations they had undertaken from 1 January 1990 to 31 December 2010. Data on a total of 708 teeth from 637 patients were collected. After data screening and elimination, participants of this study consisted of 183 teeth of 171 males ranging from 20 to 72 years of age (mean age, 44·8 years). The cumulative survival rate was 86·0% at the 5-year mark, 59·1% at 10 years and 28·0% at 15 years. The mean survival time was 134·5 months, as calculated by the Kaplan-Meier method. Single factor analysis using the log-rank test showed that the following factors had significant influence (P < 0·05) on survival of transplanted teeth: periodontal disease as the reason for recipient site tooth extraction, fewer than 25 present teeth and Eichner index Groups B1 to C. Cox regression analysis examined five factors: age, smoking habit, recipient site extraction caused by periodontal disease, fewer than 25 present teeth and Eichner index. This analysis showed that two of these factors were significant: fewer than 25 present teeth was 2·63 (95% CI, 1·03-6·69) and recipient site extraction caused by periodontal disease was 3·80 (95% CI, 1·61-9·01). The results of this study suggest that long-term survival of transplanted teeth in males is influenced not only by oral bacterium but also by occlusal status.

Survival Rate in Autotransplanted Premolars with Complete Root Formation: A Retrospective Clinical Survey

“…Surgical procedure did, however, vary slightly. The details of the procedures used by the 37 dentists are provided in our previous reports 30,31) .…”

“…A total of 102 transplanted teeth were lost, and the survival rate of all types of teeth was 90.1% at 5 years and 70.5% at 10 years. In another of our previous studies 31) , 183 third molars in 171 males ranging from 20 to 72 years in age (mean age, 44.8 years) were examined. The cumulative survival rate was 86.0% at the 5-year mark and 59.1% at 10 years.…”

“…Autotransplantation of teeth with complete root formation has been reported often since around 1980 [1][2][3][4]12,18,23,26,[28][29][30][31] . A number of previous studies investigating the survival rate in autotransplanted teeth have reported on cases involving complete root formation of the donor teeth.…”

“…Non-functional teeth such as third molars, malpositioned teeth, or teeth extracted during orthodontic treatment are often used as donor teeth for autotransplantations [1][2][3][4]9,12,18,19,23,[26][27][28][29][30][31] . Premolars often erupt with malalignment and do not serve a functional purpose.…”

Autotransplantation for the Management of Teeth with Severe Alveolar Bone Resorption: A Case Report

“…Successful autotransplantation was first reported in the 1950s [2,3] since then, numerous studies on this technique have been conducted and many teeth have been autotransplanted. Although it is a well-established procedure and has proven to be a highly successful rehabilitation technique, [4][5][6][7] it is rarely performed in the clinic setting because of advances in osseointegrated implant procedures [8].…”