Table 1.

Resin composites used in this study.

Resin composite	Manufacture	Color	Classification	Filler (wt.%)	Matrix
Microfiller-Durafill VS	HeraeusKulzer, Wehrheim, Germany	A2E	Microfiller	50.5	Bis-GMA, UDMA, TEGDMA
IPS Empress Direct	Ivoclar Vivadent, Amherst, NY, USA	A2E	Nanohybrid	78.1	UDMA, TCDMMA, Bis-GMA
Filtek Z350XT	3M-ESPE, St. Paul, MN, USA	A2E	Nanofiller	72.5	Bis-GMA, UDMA, -TEGDMA, Bis-EMA