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.