Aim: This in vitro study was conducted to evaluate the effect of lase peroxide sense, and whitening lase II radiation on gingival microleakage of three types of composite filling materials (tartaric N Ceram, SDR, GC). Materials and Methods: This study was performed on thirty caries free upper first premolar teeth. The Standardized class V cavity preparation on buccal and lingual surfaces of each tooth was done, then the teeth were randomly divided into two major groups: group 1 unbleached and group 2 bleached composites, then each main group divided into three subgroups; ten cavities (5teeth) for each group. The cavities were cleaned, and acid etched with 37% phosphoric acid, then bonding agent (G-permio bond) was applied according to the manufacturer's instructions. Group I and II the cavities were filled with tetric N ceram composite(Vivadent), group III and IVthe cavities were filled with SDR composite (SDI), and group V and VI the cavities filled with GC Essentia composite(GC). After filling the teeth in groups II, IV, VI were subjected to whitening lase II (DMC, USA) laser bleaching, according to manufacturer's instructions, then the teeth were thermo cycled for 500 cycles. A
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