The Influence of Thermal Cycling on the Adhesive Strength of Adhesive Resin Cement

The purpose of this study was to examine the influences of thermal cycling on the adhesive strength of the adhesive resin cements. Four kinds of adhesive resin cements, which belonged to the commercial composite resin inlay products, were used for the study. They were CR Inlay Cement, Duo Cement, Dual Cement and P-30 diluted with Enamel Bond. The shear adhesive strengths to tooth substance and composite resin inlay were measured. Adhesive strength to etched enamel : CR Inlay Cement showed the highest values of 274kg/cm2 after immersion in water at 37℃ for 24 hours and 230kg/cm2 after 300 thermal cycles at 4℃ for 3 min and at 60℃ for 3 min. Adhesive strength to etched dentin : P-30 diluted with Enamel Bond showed the highest values of 64kg/cm2 after 24-hour immersion in water, and 63kg/cm2 after 300 thermal cycles. Adhesive strength to composite resin inlay : CR Inlay Cement showed the highest values of 310kg/cm2 after 24-hour immersion in water, 306kg/cm2 after 300 thermal cycles, and 297kg/cm2 after 1000 thermal cycles. Adhesive resin cements other than CR Inlay Cement, showed a decrease in adhesive strengths to tooth substance and composite resin inlay after thermal cycling. Especially, Dual Cement and Duo Cement showed considerable decreases.