Shear Bond Strength between Resin Cements with Self-etch Adhesive Systems and Coronal Dentin
To compare the shear strength of bonds between dentin and self-etch resin cement systems with or without tertiary amine, and that of bonds between 1- and 2-step self-etch adhesive systems. Sixty-three third molars were sectioned mesio-distally and their external surfaces were ground to expose dentin. They were randomly divided into three groups of forty-two half-tooth specimens: Group 1, Panavia™ F2.0 (which contains tertiary amine) with ED® Primer II, Group 2, Nexus® 3 (which contains free-tertiary amine) with OptiBond™ XTR (a 2-step self-etch adhesive system) and Group 3, Nexus® 3 with OptiBond™ All-In-One (a 1-step self-etch adhesive system). Resin composite rods were bonded to each specimen in all three groups with the respective resin cements. Each group was divided into two subgroups. The first subgroup, consisting of twenty-two specimens, was stored in distilled water at 37°C for 24 hours and the second subgroup, consisting of twenty specimens, was subjected to thermocycling (5000 cycles, in water baths at 5°C and 55°C). Twenty specimens (n=20) from each subgroup were loaded in a Universal Testing Machine for shear bond strength testing. The resin-dentin interfaces of each first subgroup were examined by SEM. The mean shear bond strength of three different resin cement groups were significantly different (p<0.05) in both conditions. The highest mean shear bond strength was obtained with Group 2, followed by Group 3 and Group 1 showed the lowest bond strength. The mean shear bond strength of the water storage groups were significantly higher than those of the thermocycling groups. In conclusions, the shear bond strength of the resin cement without tertiary amine seems better than the resin cement that contains tertiary amine. And when the resin cement without tertiary amine was used with the 2-step self-etch adhesive, it provided greater bond strength than with the 1-step self-etch adhesive. Thermocycling process decreased the shear strength of bonds between resin cements and dentin.
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