Effect of resin coating on adhesion of composite crown restoration

The purpose of this study was to evaluate the effect of a resin coating technique on the microtensile bond strength (mu TBS) of resin cement to dentin in composite crown restorations. Crown preparations were done on human molars. A resin coating material, Hybrid Bond, was immediately applied to the prepared dentin and light-cured, while the tooth without resin coating acted as the control. An impression of the resin-coated tooth was taken, and a composite crown fabricated on the working cast. The composite crown was then bonded with a resin cement, Chemiace II. mu TBSs were measured at a cross-head speed of 1 mm/min, and the resin-coated group yielded significantly higher mu TBSs than the non-coated group (p<0.05). In terms of mu TBS values between the axial and occlusal surfaces, no regional differences in resin-dentin bond strength were detected (p<0.05). It was concluded that resin coating with Hybrid Bond significantly improved the mu TBS of resin cement to dentin in composite crown restorations.