Figure 1.

Resin-based cements used in the study

Material	Manufacturer	Composition	Filler (wt%)
All Cem	FGM Dental Products (Joinville, SC, Brazil)	Bis-GMA, Bis-EMA, TEGDMA, Ba-Al-silicate glass, silane treated silica, benzoyl peroxide, co-initiators and camphorquinone.	68
Variolink II	Ivoclar Vivadent, Schaan, Liechenstein	Bis-GMA, UDMA, TEGDMA, barium glass, ytterbium trifluoride, Ba-Al-fluorosilicate glass, zirconia/silica, benzoyl peroxide, initiators, stabilizers and pigments.	71
Enforce	Dentsply	BisGMA, TEGDMA, BHT, EDAB, fumed silica, silanized barium, aluminum borosilicate glass.	66
Rely-X ARC	3M-ESPE, St. Paul, MN, USA	Bis-GMA, TEGDMA, zirconia/silica filler, pigments, benzoyl peroxide, amine and photoinitiator.	67.5