ABSTRACT
Introduction: The aim of this study was to evaluate and compare microhybride composite treated by bur and different power of Erbium, Chromium doped Yttrium Sc and ium Gallium Garnet [Er, Cr:YSGG] laser by Scanning Electron Microscope [SEM]. Methods: 21 microhybride composite blocks [DiaFil TM, DiaDent, Korea] with 2 × 4 × 4 mm dimensions were made. The bonding surface of these blocks were polished, The samples were put into 6 groups for laser irradiation as follows: Group 1 [power: 1W, Energy: 50 m/l]; Group 2[power: 2 W, Energy: 100m/l]; Group 3 [power: 3W, Energy: 150m/l]; Group 4 [power: 4W, Energy: 200m/l]; Group 5 [power: 5W, Energy: 250m/l] and Group 6[power:6 W, Energy:300m/l]. One group prepared by bur- treated. All samples were prepared by repetition rate of 20 Hz. Then, the samples were prepared for SEM examination. Result: Some irregularities were seen in Er, Cr:YSGG laser samples in comparison to Bur group that produced favorable surface for adhesion of repair composite. Conclusion: Among different lasers, Er;Cr:YSGG laser can be chosen as a suitable technique for surface treatment of unsatisfactory composites