RESUMO
Dentin bonding agents are gradually replacing enamel bonding agents in the clinical setting. Considering the different properties of these two materials, their bonding strength to enamel may be different. The aim of this study was to compare the shear bond strength of composite restorations to enamel using dentin bonding and enamel bonding agents. In this experimental study, buccal surfaces of 24 freshly extracted primary and permanent teeth were polished by the polishing papers in order to obtain a piece of flat enamel 3 mm in diameter. After etching, rinsing and drying the surfaces, the specimens were divided into 4 groups. Enamel bonding [Margin Bond] was applied to the surfaces of 6 primary and 6 permanent teeth and Single Bond was applied to the surfaces of the remaining teeth. All teeth were cured. Composite resin [3mm in diameter and 4 mm in height] was applied to the prepared surfaces. Then, the specimens were thermocycled for 2000 cycles and the shear bond strength was determined using an Instron universal testing machine. The findings were analyzed by SPSS and two-way ANOVA. There was no significant difference in the mean shear bond strength of the two groups of primary and permanent teeth [P=0.518]. Also, no significant difference was found between enamel and dentin bonding agents in primary and permanent teeth [P =0.17]. The shear bond strength of composite to enamel was not significantly different between the primary and permanent teeth following the use of enamel or dentin bonding agents