The Effect of Dual-Cured Activator with Adhesive on Shear Bond Strength of Resin Cement and Dentin
Purpose: To investigate the effect of dual-cured activator (Single Bond Universal DCA) combined with Single Bond Universal adhesive on shear bond strength of RelyX™ Ultimate resin cement and dentin.
Materials and Methods: Thirty-four third molars were sectioned mesio-distally. Their external of mid-buccal and lingual surfaces were ground into the flat plane to expose dentin. They were randomly divided into four groups (n=17) and etched with 34% phosphoric acid for 15 seconds. Single Bond Universal adhesive was applied to Group 1 (NDCA+LC) and Group 2 (NDCA+NLC). A mixture of Single Bond Universal adhesive and Single Bond Universal DCA was applied to Group 3 (DCA+LC) and Group 4 (DCA+NLC). Resin composite rods were bonded to the specimen with RelyX™ Ultimate. Groups 1 and 3 specimens were light-cured through the resin composite rods. Groups 2 and 4 specimens were kept in an dark box for 15 minutes. All specimens were then stored in 37°C distilled water for 24 hours. Fifteen specimens from each group were loaded in a Universal Testing Machine for shear bond strength testing. Mean shear bond strength from each group was analyzed by One-way ANOVA and Tukey multiple comparison test (p<0.05). The failure surfaces of resin cement and dentin were examined by light stereomicroscope. Two pieces of specimens in each group were cross-section at the middle and observed the resin-dentin interface by SEM.
Results: The highest mean shear bond strength was Group 3 (25.18±6.42 Mpa) followed by Group 1 (22.18±2.73 Mpa), Group 4 (6.27±3.96 Mpa) and Group 2 (4.48±2.73 Mpa). No statistical differences were found between group which use and not use dual-cured activator. The statistical significantly higher bond strength was found in light cured groups. Mixed failure mode presented in almost all specimens.
Conclusions: Using Single Bond Universal DCA with Single Bond Universal adhesive has no effect on the shear bond strength of RelyX™ Ultimate resin cement and dentin.
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