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Introduction: Dental amalgam is regarded as a popular restorative material. The purpose of this study is to investigate the reasons of replacing amalgam restorations in patients referring to Babol dental school within 2013-2014. Methods: In this analytic-descriptive study, age, sex, type of occlusion DMF, existence of parafunction, as well as type of tooth, restoration class and reason of amalgam restoration replacement were recorded in patients referred to the Babol dental school during 2013-2014. Furthermore, the study data were analyzed using descriptive statistical analysis. Results: Within 263 patients, there were 81(30.8%) men and 182(69.2%) women. Most patients aged 30-40(42.2%), and were reported to suffer from class Ι dental occlusion(92.4%).The mean DMF was 9.7±2.4 . Lower molars were demonstrated as the most frequent teeth group for replacing amalgam restorations as well as causing secondary caries. Furthermore, secondary caries involved the major causes of amalgam restoration replacement. The most prevalent class for amalgam restoration replacement was class II restorations. It should be noted that secondary caries were most prevalent within class II MO / DO(25 cases(44.6%)). Conclusion: The study findings revealed that the most common cause of the restoration replacement involved the secondary caries which was most observed in the Class II restorations.

Keywords: Amalgam, Replacement, Restoration

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