Bond Strength to Dry and Wet Enamel with Self-etching Adhesives

Objective: The aim of this in vitro study was to compare the shear bond strength of 3 self-etch adhesives to dry and wet bovine enamel.Method: Flat enamel surfaces were prepared on 77 intact bovine lower incisors by a 600 grit polish paper.Then the teeth were randomly divided into 7 groups of 11 teeth: Prompt L-Pop (PLP) +Z100, Clearfil SE Bond (CSEB) +Clearfil AP-X and i Bond (i B) +Venus in dry condition and in wet condition and Margin Bond (Control)+Brilliant.In dry condition, enamel surfaces were air-dried for 10 seconds or blot dried in wet condition. Composite resin was bonded on the enamel by means of a cylindrical Teflon split mold. After 24 hours of storage in dionized water at room temperature, all the specimens were thermocycled and then loaded in shear by a universal testing machine (Instron) with a cross-head speed of 1mm/min. The shear bond strength was recorded in MPa.Results:The data were analyzed with ANOVA and Scheffe statistical tests. In dry condition, mean shear bond strength of CSEB (21.5±4.8) was significantly higher than PLP and i B (p<0.001). Shear bond strength of i B(9.60±2.2) and PLP (9.49±3) were significantly lower than CSEB and control (20.99±5.1) (p<0.001).In wet condition, shear bond strength of CSEB (21.8±3) was significantly higher than PLP (10.6±4) and i B (10.8±3).There were no significant difference between PLP and iB in dry condition and wet condition.Shear bond strength in dry and wet conditions revealed no significant difference in each of 3 self-etching adhesives. Conclusion:Based on the result of this study, CSEB had higher bond strength to enamel compared to PLP and iB.Three Self- etch adhesives didn't show technique sensitivity to wet and dry enamel.