Table 1.

Materials used in this study.

Material	Composition	Lot/Manufacturer
Zirconia/Ceramill Zi	Yttria stabilized polycrystalline tetragonal zirconia (Y-TZP) blank (ZrO2 + HfO2 + Y2O3 99.0)	1512006-1/Amann Girrbach/Koblach/Austria
Primer/Scotchbond Universal	MDP/Vitrebond copolymer/HEMA/silane/ dimethacrylate resins/fillers/initiators/ethanol	635860/3M ESPE, Germany
Resin cement/RelyX Ultimate	Base: Methacrylate monomers/radiopaque, silanatedfillers/initiators/stabilizers/ Rheological additives Catalyst: Methacrylate monomers/ radiopaque, alkaline fillers/initiators/stabilizers/pigments/ Rheological additives/fluorescence dye/dark cure activator for Scotchbond Universal adhesive	636403/3M ESPE, Germany
Composite resin Filtek Z250, shade A1.	(Bis-GMA, UDMA, Bis-EMA, ZrO2/SiO2)	762333/3M ESPE, USA