Table 1.

Materials used.

Product	Description	Composition	Manufacturer
Filtek Z250	Micro-hybrid universal composite restorative	Matrix: bisGMA, UDMA, TEGDMA, Bis-EMA	3M ESPE St. Paul, MN
		Filler (78 wt%/60 vol%): silica/zirconia. The filler particle size distribution is 0.01 µm to 3.5 µm with an average particle size of 0.6 µm.
Filtek 350 XT	Nano-filled visible light-activated universal composite restorative	Matrix: bis-GMA, UDMA, TEGDMA, bis-EMA, PEGDMA resins.	3M ESPE St. Paul, MN
		Fillers (72.5 wt%/55.6 vol%): Combination of 20 nm non-agglomerated/non-aggregated silica filler; 4–11 nm non-agglomerated/non-aggregated zirconia filler, and 0.6–10 µm surface modified aggregated zirconia (4–11 nm)/silica (20 nm) clusters.
Filtek 350 XT Flowable	Nano-filled visible light-activated flowable composite restorative	Matrix: bis-GMA, TEGDMA, procrylate resin	3M ESPE St. Paul, MN
		Fillers (65 wt%/46 vol%): Combination of 1–5 µm yetterbium triflioride fillers; 20 and 75 nm non-agglomerated, non-aggregated silica fillers and 0.6–10 µm surface modified aggregated zirconia (4–11 nm)/silica (20 nm) clusters.
Filtek Bulk-fill	Nano-filled visible light-activated posterior composite restorative.	Matrix: AUDMA, UDMA and 1, 12-dodecane-DMA.	3M ESPE St. Paul, MN
		Filler (76.5 wt%/58.4 vol%): combination of a non-agglomerated/non-aggregated 20 nm silica filler, a non-agglomerated/non-aggregated 4 to 11 nm zirconia filler, aggregated zirconia/silica cluster filler (comprised of 20 nm silica and 4 to 11 nm zirconia particles) and a ytterbium trifluoride filler consisting of agglomerate 100 nm particles.
Opalescence Boost PF	Chemically-activated neutral (pH 7) in-office bleaching agent	Barrel 1: 1.1% sodium fluoride and 3% potassium nitrate, along with a unique chemical activator.	Ultradent Products Inc. South Jordan, UT
		Barrel 2: Hydrogen peroxide.
		After mixing the final hydrogen peroxide concentration is 40%.
Gelato APF gel	Acidulated phosphate fluoride gel	Active ingredients: 2.09% Sodium fluoride and Hydrofluoric acid providing 1.23% fluoride ions.	Deepak Inc. Miami, FL
		Inactive ingredients: Flavor, phosphoric acid, sodium saccharin, xylitol, citric acid, sodium benzoate, water, titanium dioxide polysorbate 20, xanthan gum, magnesium aluminum silicate, FD&C red # 40.