Table 1: Characteristics of the conventional and bulk-fill composite resins tested in this study.

Code Commercial Brand Type of Composite Manufacturer Composition Filler Percentage Color
1 EverX Posterior (EXP) Short fiber composite GC Corp., Tokyo, Japan Short E-glass fiber filler, barium glass, Bis-GMA, PMMA, TEGDMA 74.2wt% 53.6vol% Universal
2 Filtek Bulk Fill Posterior(FBP) Nano fill 3M ESPE, St. Paul, MN, USA Non- agglomerated/non-aggregated 20 nm silica filler,non-agglomerated/non-aggregated 4 to 11 nm zirconia filler,aggregated zirconia/silica cluster filler,ytterbium trifluoride filler consisting of agglomerate 100 nm particles,ERGP-DMA,diurethane-DMA,1, 12-dodecane-DMA 76.5wt%58.4vol% A2
3 Sonic Fill 2(SF2) Nano Hybrid Kerr corp., Orange, CA, USA Poly(oxy-1,2-ethanediyl), α,α′-[(1-methylethylidene)di-4, 1-phenylene]bis[ω-[(2-
methyl-1-oxo-2-propen-1-yl)oxy]-Not available. 2,2′-ethylenedioxydiethyl
81.3wt% unreported. A2
4 Tetric N-Ceram Bulk Fill(TNB) Hybrid Ivoclar Vivadent AG, Schaan, Liechtenstein Barium glass,Prepolymer,Ytterbium trifluoride,Mixed oxideBis-GMA, DMA 75-77wt%53-55vol% IVA
5 X-tra fil(XF) Hybrid VOCO Cuxhaven, Germany Barium-boron- aluminosilicate glass,Bis-GMA, UDMA, TEGDMA 86wt%70.1vol% Universal
6 Filtek Z250 Universal(Z250) Micro Hybrid 3M ESPE, St. Paul, MN, USA zirconia/silica without
silane treatment,Bis-GMA, UDMA, Bis-EMA
82wt%60vol% A2