[Clinical evaluation of the amalagam restorations for cavities Class I and Class II. 3: Comparison between dental school and dental institutions in the community].

Comparison of conventional amalgam restorations produced either in dental college by students or in out-patient department showed that the portion of clinical acceptable restorations was higher at the college. The frequency of secondary caries was distinctively higher in the out-patient department (28.2%) than in the college (16.4%). Secondary caries mainly caused unacceptable quality of fillings of both the institutions. Causes brought about by material defect prevailed at the dental school. In the community errors of preparation mainly led to secondary caries.