الفهرس 
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Abstract
Objectives: The purpose of the present study was to evaluate a bulk fill resin composite comparing it with a conventional build up one, using two different curing lights, quartz tungsten halogen (QTH) and light emitting diode (LED), regarding; degree of conversion (DC), microleakage, microhardness and fracture toughness.Methods: Two nanohybrid resin composites were investigated in the study. One is a bulk fill (Tetric N-Ceram Bulk Fill) and the other one is placed incrementally (Tetric N-Ceram). Specimens of each resin composite were divided into two equal groups (group A cured with QTH and group B cured with LED). DC, microleakage, microhardness and fracture toughness of different groups were studied. The results were then statistically analyzed and compared.Results: There were no significant differences among the materials tested, regarding; DC, microleakage, microhardness and fracture toughness. In addition, none of the used curing lights had a pronounced effect on the properties of the tested composites.Conclusions: The tested properties of Tetric N-Ceram Bulk Fill composite resin were nearly equal to its counterpart incremental one. Both types of lights were nearly equally effective in curing both types of composite resin.