Objectives: It is very important to evaluate the risk of losing a tooth in order to predict the tooth life-expectancy in the field of preventive dentistry. Various investigations for finding the causes of tooth loss have been carried out and caries, periodontitis, and sometimes prosthodontic treatment have been indicated as contributors. The purpose of this study was to clarify the risk of loss of prosthodontically treated teeth by investigating the reasons for tooth extraction. Methods: The data used in this study were collected from clinicians who had over 15 years clinical experience using questionnaire. The statistical significance was calculated by using the chi-square test. Results: The number of teeth analyzed in this study was 716 from 706 patients (381 males and 325 females) with an average age of 53.3±10.8S.D. Among the extracted teeth, prosthetically treated teeth accounted for 46.4%; and others, for 53.6%. In comparison of the causes for tooth extraction between the teeth with prosthetic treatment and those without it, there was no difference found between them. On the other hand, periodontitis was found to be the greatest cause of extraction whether the teeth had been treated prosthetically or not. A significant difference (p=0.0163) was found in root fracture between the teeth with prosthetic treatment and those without it. Moreover, 74.1% of the prosthetically treated teeth had received endodontic treatment, suggesting a possible relation between root fracture and endodontic treatment. Conclusion:When prosthetic treatment is considered from the point of view of the cause of tooth extraction, we strongly suggest that standardization of the periodontal condition of those extracted teeth be done before analysis.

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