This study will evaluate the effect of diferent bulk fill composite resin and thermal and mechanical loading cycling (TMC) on microleakage in composite resin restorations. One hundred cavities will be prepared (1,5 X 4 X 5 mm) and randomly divided i 10 groups (n=10) according to bulk fill composite resin and TMC. Following the restorative procedures and thermocycling, the samples will immersed in methylene blue for 12 hours. The samples will be ground and the powder prepared for analysis in an absorbance spectrophotometer. All the results will be statistically analyzed.
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