SHEAR BOND STRENGTHS OF ONE-BOTTLE DENTIN ADHESIVES USING MULTIPLE APPLICATIONS

This study evaluated the effect of multiple applications of the one-bo ttle adhesives Prime & Bond,One-Step,and Tenure Quik on the shear bond strength of composite to dentin. In addition, the study examined the effects of surface moisture and dual-cure composite on bond strengths of One-Step and Tenure Quik respectively. The adhesive systems were bo nded to the occlusal dentin of extracted human teeth. Control group sp ecimens received only two applications of adhesive, as recommended by the manufacturers. Two experimental groups of each system received a g reater number of adhesive applications. Additional experimental groups using only two adhesive applications were made to test modifications in surface moisture and composite type for One-Step and Tenure Quik. S hear bond strengths were determined using an Instron Universal Testing Machine. The mean shear bond strength of the Prime & Bond control gro up was significantly greater than that of the other two control groups . Multiple applications of adhesive decreased the bond strength of eac h system, but the difference was significant only for four application s of One-Step. The method of moisture removal (compressed air or blott ing) had no effect on shear bond strength of One-Step, The sheer bond strength of Tenure Quik was not affected by the type of composite used . Prime & Bond had significantly higher shear bond strengths to dentin than either One-Step or Tenure Quik. Both Prime & Bond and One-Step h ad significantly higher bond strengths than Tenure Quik.