Abstract

Background: As the polymerization pattern of methacrylate-based composite resins (MBCR) differs from siloran-based composite resins (SBCR) ones, the aim of present study was an evaluation of the micro-shear bond strength (μSBS) of SBCR bonded to aged MBCR after sandblasting with micro and nano abrasive particles with or without silane application. Methods: 80 samples of MBCR were prepared by light curing. After incubation, they were thermocycled for 5000 cycles. Then, the specimens were divided into two subgroups randomly. The first group was air abraded by 50 µm particle of Al2O3 and was divided into 4 subgroups (M1, M2, M3, and M4). The second head group was air abraded by 80 nm Al2O3 and was randomly divided into four subgroups (M5, M6, M7, and M8). After etching, the surface were conditioned by methacrylate-based adhesive with (M2 and M6) or without (M1 and M5) silane coupling agent. The same procedure was done for silorane-based adhesive (M3 and M7/M4 and M8). Each MBCR group was bonded to its correspondence SBCR group, and μSBS was done on each bonded samples. The collected data were subjected to Kolmogorov-Smirnov, ANOVA, Tukey and three-way ANOVA tests by SPSS software ver.20 at 5 significance level. Results: The results manifested significant differences among all groups (P = 0.00). Furthermore, the pattern of μSBS fracture was 100 in adhesive part in all of the groups. Conclusion: Micro sized abrasive particles provide higher μSBS than nano ones in aged composite resins. Furthermore, the application of silane prior to adhesive resins is recommended for achieving higher μSBS. © 2016 Wolters Kluwer Medknow Publications. All rights reserved.