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Abstract
Restored using X-tra fil bulk fill resin composite placed in one 4 mm increment in both cavities and then cured according to different curing protocols of different groups. Finishing and polishing of composite restorations was done. The teeth were stored in distilled water at 37oC for 24 hours before testing. The result of current study showed that the tested bulk-fill resin composite (X-tra fil) achieved at least 80% depth of cure value at the manufacturer’s claimed maximum increment thickness of (4mm) with irradiation times stated by the manufacturer (10 seconds). Regarding the curing direction, the result of current study revealed a non-significant difference in depth of cure between occlusal, transtooth and occlusal/transtooth curing in moderate width cavities. While for wide cavities, the highest depth of cure was obtained by occlusal and transtooth curing compared with occlusal curing alone. The top, middle and bottom microhardness also showed a non-significant difference between curing directions except for top microhardness for moderate cavities with 10s curing, where occlusal curing showed significantly higher value