MTS of dentin adhesive systems to different dentin

Objectives: To evaluate the microtensile bond strength of total-etch / self-etch adhesives to different dentin. Methods: The adhesive systems, two total-etch adhesives (All-Bond 2,Single Bond)and two self-etch adhesives (Fluoro Bond,Xeno III) were applied in normal dentin, caries-affected dentin and cervical sclerotic dentin. Samples were tested in tension in a Microtensile tester at 1 mm/min. Each fractured specimen was examined by Stereo microscope and SEM. Results: Two-way ANOVA revealed a significant influence of both the type of dentin and the adhesive systems tested on microtensile bond strength values. However, the interaction of these two factors was not statistically significant. All the adhesives attained highest strengths in normal dentin. In cervical sclerotic dentin, significantly higher results were obtained with All-Bond 2. In caries-affected dentin, significantly lower results were obtained with Xeno III.The major mode of failure was adhesive failure. Conclusions: The total-etch adhesives evaluated produced different bond strengths to self-etching systems in normal and caries-affected and cervical sclerotic dentin. It was recommended that dentin adhesive agent should be used according to the type of dentin and the clinical situation.