Effects of diamond and carbide burs on Dentin bond Strengths of self-etch bonding systems

Bachground and Nowadays, with regard to the quantitative and qualitative development of dental esthetic 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 efficiency of diamond and carbide burs on bond strength of a self-etch adhesive to dentin. In this in vitro experimental study sixty sound extracted human third molars were mounted in self cure acrylic resin. The teeth were randomly assigned to two groups (n=30 each). In the first group, the teeth were ground with high-speed medium grit diamond bur and in the second group the teeth were ground with high-speed carbide burs. A composite cylinder with a 3 mm diameter was bonded to each specimen with a self-etch adhesive system and the shear bond test was performed using a universal testing machine. The results were expressed in MPas and were subjected to and Tukey's test. The mean shear bond strength in diamond and carbide burs were 17.67 MPa (SD= ±4.41) and 14.51 MPa (SD= ±5.18), respectively. There was a significant difference in dentin bond strength between two groups. (P< 0.05). The use of different burs affect the shear bond strength of the self-etch adhesives to dentin. This adhesive performed significantly better when a diamond bur was used to prepared dentin surface.