ABSTRACT
OBJECTIVES: The objective of this in vitro study was to compare the microtensile dentin bond strength (µTBS) of five seventh-generation dentin bonding agents (DBA) with fifth-generation DBA before and after thermocycling. MATERIALS AND METHODS: Ten extracted teeth were assigned to fifth generation control group (optibond solo) and each of the five experimental groups namely, Group I (G-Bond) ,Group II (S(3) Clearfil), Group III (One Coat 7.0), Group IV (Xeno V), and Group V (Optibond all in one). The crown portions of the teeth were horizontally sectioned below the central groove to expose the dentin. The adhesive resins from all groups were bonded to the teeth with their respective composites. Specimens of sizes 1 × 1 × 6 mm(3) were obtained. Fifty specimens that bonded to dentin from each group were selected. Twenty-five of the specimens were tested for debonding without thermocycling and the remaining were subjected to thermocycling followed by µTBS testing. The data were analyzed with one-way ANOVA and Dunnett's-test for comparison with the reference group(Vth Generation). RESULTS: There was no significant difference (P > 0.05) between the fifth- and seventh-generation adhesives before and after thermocycling. The results of our study showed significantly higher value (P < 0.05) of µTBS of seventh-generation Group II (Clearfil S(3)) compared to the fifth-generation before and after thermocycling. CONCLUSION: The study demonstrated that the Clearfil S(3) bond had the highest µTBS values. In addition, of the five tested seventh-generation adhesive resins were comparable to the fifth-generation DBA.
