[Studies on the marginal leakage of various setting materials of a metal crown, including newly developed adhesive resins].

The gap between a metal crown and an abutment tooth often leads to troubles such as secondary caries, pulpitis, periodontitis and so on. We expected that newly developed adhesive resins which adhere both dental alloy and tooth structure can minimize such troubles if they were used as setting materials of prosthetics. In this study, the degree of marginal leakage of adhesive resins was compared with that of conventional dental cements. The results obtained were as follows : 1) The degree of marginal leakage of metal crowns was always greater in the dentin margin than in the enamel margin. 2) Adhesive resins showed much more excellent marginal closure than conventional dental cements. 3) No correlation was observed between the fitness of a metal crown and the degree of marginal leakage. 4) The degree of marginal leakage was always greater in the etched margin, especially in the etched enamel margin, than in the non-etched margin.