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This study evaluated the effect of polymerization mode and time and thermal and mechanical loading cycling (TMC) on microleakage in composite resin restorations. One hundred and eighty cavities were prepared and randomly divided according to the light curing time (20, 40, or 60 s), modes (quartz–tungsten–halogen (QTH)—420 mW/cm2, LED 2 (2nd degree generation)—1,100 mW/cm2, or LED 3 (3rd degree generation)—700 mW/cm...
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