Table 1.

Bulk-fill composite materials used in the study.

Resin composite	Type	Manufacturer	Bonding agent	Maximum increment thickness recommended by manufacturer	Composition according to manufacturer's information	Number of restorations
Filtek Bulk Fill	Flowable	3M ESPE	Adper Single Bond 2	4 mm	Bis-GMA, UDMA, Bis-EMA, and Procrylat resins. Fillers are a combination of zirconia and silica having a particle size of 0.01–4.5 microns and ytterbium trifluoride filler having a particle size of 0.1–5.0 microns	30
SDR	Flowable	Dentsply DeTrey	XP Bond	4 mm	Barium aluminofluoroborosilicate glass, strontium aluminofluorosilicate glass, modified urethane dimethacrylate resin, ethoxylated bisphenol A dimethacrylate (EBPADMA), triethylene glycol dimethacrylate (TEGDMA), camphorquinone photoinitiator, butylated hydroxytoluene (BHT), UV stabilizer, titanium dioxide, and iron oxide pigments	30
SonicFill	Sonic flowable	Kerr	OptiBond Solo Plus	5 mm	Glass, oxide, chemicals (10–30%), 3-trimethoxysilylpropyl methacrylate (10–30%), silicon dioxide (5–10%), ethoxylated bisphenol A dimethacrylate (1–5%), bisphenol A bis(2-hydroxy-3-methacryloxypropyl) ether (1–5%), and triethylene glycol dimethacrylate (1–5%)	30
Tetric EvoCeram Bulk Fill	Packable	Ivoclar Vivadent	ExciTE F	4 mm	Monomer matrix containing dimethacrylates (20-21% weight). The fillers contain barium glass, ytterbium trifluoride, mixed oxide, and prepolymer (78%–81% by weight). Additional contents are additives, catalysts, stabilizers, and pigments (<1.0% weight)	30