| Objective: To evaluate the influence of three dentin desensitizers on shear bond strengths of a total-etch adhesive to dentin surfaces.Methods: Forty recently extracted human premolars stored in 0.1% thymol were used. The buccal and lingual surfaces of teeth were prepared to create flat dentine surfaces. Then each dentin surface was mounted in autopolymeric resin. Eighty flat dentine surfaces were divided into eight groups. Dentin specimens treated with 30% potassium oxalate, 33% potassium nitrate, Green Or, distilled water respectively before and after being acid-etched were bonded with a two-step adhesive. Resin composite Cylinders of Z250 resin composites were then placed. The specimens were stored in distilled water at 37°C for 24 hours , then shear bond strengths were measured by using a Universal Testing Machine at a crosshead speed of 0.5mm/min. Two-way ANOVA and Tukey's tests were used to compare the different conditions for the total-etch system.Results: For the water-treated group, shear bond strength was significantly greater than desensitizers-treated groups. However, when any of the dentine desensitizer was applied before and after being acid-etched, there was not significantly difference. Conclusions: Based on the limited results of this study, it can be concluded that the three dentin desensitizers decreased the bond strength of Single Bond bonding system.
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