ABSTRACT
The aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment. 40 human extracted molars divided into 4 groups [n=10] received the following treatments. Group 1: carbide bur, Group 2: air abrasion with aluminum oxide 50 microm, Group 3: irradiated with Erbium-Doped Yttrium Aluminum Garnet [Er: YAG] laser [150 mJ/20Hz], Group 4: irradiated with Er: YAG laser [150 mJ/20Hz]+ air. Specimens in all groups were chemically etched with phosphoric acid 37% and treated with bonding agent [single bond 3M]. Then, composite build-up was performed by tygon tube. After storage in distilled water at 37°C for one week, all specimens were subjected to a shear bond strength test with universal testing machine. Data were analyzed with ANOVA and T-Test. The mean and standard deviation of shear bond strength of the 4 groups were 20.8 +/- 6.76, 14.98 +/- 3.98, 11.43 +/- 4.36 and 14.95 +/- 3.18 MPa, respectively. Air abrasion after laser treatment improved the shear bond strength