In the past, amalgam and direct gold fillings were the options for dental practitioners to use as posterior restorative material. The demand for better esthetics, possible mercury toxicity from amalgam has changed the perspective. Improvements in resin composite materials have made composite restorations a popular alternative to amalgam restorations in posterior teeth. How ever there are problems associated with using resin composite restorations including, marginal leakage, postoperative sensitivity and secondary caries. It is believed that the gap formed because of polymerization shrinkage...