Table 1. Materials used in this study.

Materials			Composition (wt%) (Phase ratio)
Zirconia
	3Y-TZP	Rainbow Shade	ZrO2 83-96%, Y2O3 4-7%, HfO2 ≤ 5%, Al2O3 ≤ 1%, Other oxides (80% tetragonal, 20% cubic phase)
	4Y-PSZ	Rainbow Shine T	ZrO2 81-94%, Y2O3 6-9%, HfO2 ≤ 5%, Al2O3 ≤ 1%, Other oxides (50% tetragonal, 50% cubic phase)
	5.5Y-PSZ	Rainbow High Shine	ZrO2 79-92%, Y2O3 8-11%, HfO2 ≤ 5%, Al2O3 ≤ 1%, Other oxides (35% tetragonal, 65% cubic phase)
Lithium disilicate
	LS	Rosetta SM	SiO2 ≤ 85%, Li2O ≤ 13%, Other oxides

3Y-TZP (3 mol% yttria tetragonal zirconia polycrystals), 4Y-PSZ (4 mol% yttria partially stabilized zirconia), 5.5Y-PSZ (5.5 mol% yttria partially stabilized zirconia), LS (lithium disilicate).