[Influence of luting materials on marginal fitness and tensile strength of full veneer crowns. Comparison between conventional dental cements and adhesive luting resins].

The ability of luting materials to minimize the marginal opening during the cementing process is an important factor in preventing recurrent caries and gingival inflammatory response. The newly developed adhesive resins may have the possibility to achieve better retention and to minimize the microleakage at the tooth/restoration interface since they have the ability to adhere both dental alloy and tooth structure. The purpose of this study is to compare the marginal fit and tensile strength of full veneer crowns cemented by two adhesive resins--Panavia EX and Super-Bond C&B--with those cemented by three usual luting materials-zinc phosphate cement, polycarboxylate cement, and glass-ionomer cement--. The results were summarized as follows: 1. Panavia EX provided the most excellent marginal fit, whereas Super bond C&B the worst. 2. There was no significant difference in marginal fit between the shoulder and the chamfer configuration in every luting material examined. 3. The tensile strength of full veneer crowns cemented by the two resins was approximately 4-5 times as large as that cemented by other three luting materials. 4. The results show that Panavia EX was superior to other four materials in that it had the highest tensile strength and the least marginal opening at the crown/abutment interface.