Efficiency of the diamond versus carbide burs on the bond strength of composite to dentin in a self-etch bonding system

ABSTRACT

Nowadays, with regard to the quantitative and qualitative growth of dental-plastic services and qualitative advances made in tooth-colored restorations, there is a great rise of demands for use of composite resins. The aim of this study was to assess the efficacy of diamond burs in comparison with carbide burs on bond strength of self etch adhesives to dentin. In this in vitro experimental study, sixty sound extracted human third molars were selected and mounted in a self-cure acrylic resin. Then, teeth were randomly assigned to two groups, [n=30 each] In group A the teeth were ground with high-speed medium grit diamond bur and in group B with high-speed carbide burs. A composite cylinder 3 mm in diameter was bonded to each specimen with a self-etch bonding system and the shear bond test with performed using a universal testing machine. The results were expressed in MPa and were subjected to and Tukey's test. The average shear bonding strength in diamond and carbide burs were 17.67 [SD= +/- 4.41] and 14.51 [SD +/- .18] MPa, respectively. There was a significant difference in dentin bond strength when comparing bonding strength between two groups [P< 0.05]. The use of different burs was considered influential on the shear bond strength of the self-etch adhesives 'to dentin. This adhesive significantly outperformed when a diamond bur was used to prepare dentin surface