ABSTRACT
Cementation of indirect restorations with resin cements, does not always provide better bonding performance to dentin when compared with direct dentin bonding systems. Immediate dentin sealing was introduced to overcome this problem with some successful reports. The aim of this study was to compare the effect of immediate dentin sealing on shear bond strength of resin to dentin. In this study, 66 human third molars were randomly divided in three equal groups: 1- Bonding composite blocks with dual cured RelyX ARC cement to dentin without pretreatment. 2- Bonding composite blocks with dual cured Rely XARC cement to immediately sealed dentin with single bond and 3- Bonding composite blocks with dual cured Rely X ARC cement to immediately sealed dentin with single bond and a flowable composite. Shear bond strengths were measured with a universal testing machine. Data were analysed by one-way ANOVA and Tukey statistical tests. Means and standard deviations of tensile bond strengths were as follows: groupl:8.55 +/- 3.18, group 2: 6.67 +/- 2.21 and group 3: 14.07 +/- 5.02. The differences in shear bond strength between groups were different significantly only when group 3 was compared with groups 1 and 2 [P= 0.000]. Immediate dentin sealing with dentin bonding had no effect on bond strength. Use of flowable composite in combination with single bond improved bond strength