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Abstract
Objective: This study was conducted to evaluate micro-tensile bond durability of self-adhering flowable composite to dentin in comparison to nano-fill flowable composite. Material and methods: Thirty extracted human molars free from caries or cracks were selected. The teeth were divided randomly into three main groups (A) 10 teeth each. (A1) was for Nano fill flowable resin composite with self-etch adhesive (control); (A2) was for self-adhering flowable resin composite with self-etch adhesive and (A3) was for self-adhering flowable resin composite alone. Each main group was divided into two subgroups (T) according to time of testing; (T1) after 1 day, (T2) after 90 days. All specimens were stored in isotonic saline till testing. The mid dentin was used in this study. The application of the materials was according to manufacturers’ instructions. Automated diamond saw (Isomet 4000) was used to get 3 composite/dentin beams (0.9 mm x 0.9 mm) from each tooth and the failure mode was recorded. Data were analyzed using two-way ANOVA and Tukay{u2019}s post hoc test (p=0.05). Reults: The results revealed that the highest microtensile bond strength was provided by Filtek{u2122} Z350 XT with self-etch adhesive (Single Bond Universal) group after 1 day. While the lowest microtensile bond strength was provided by Fusio{u2122} liquid dentin only after 90 days. Conclusion: Self-etch adhesive improves bond strength of self-adhering flowable composite