Table 1.

The tested groups and materials used in this study.

Tested Groups	Material	Manufacturer	Firing Temperature (°C)	Holding Time (min)	Composition	Shade	Patch Number
EP group	IPS e.max Press	Ivoclar Vivadent, Schaan, Liechtenstein	910	15	SiO2, Li2O, K2O, P2O5, ZrO2, ZnO	HT A1	V20844
LP Group	GC LiSi Press	GC Corp, Tokyo, Japan	897	20	SiO2, Al2O3, Li2O, K2O, ZrO2, Na2O, P2O5, ZrO2	HT-E58	1,703,061
EC group	IPS e.max CAD	Ivoclar Vivadent, Schaan, Liechtenstein	850	7	SiO2, Li2O, K2O, P2O5, ZrO2, ZnO, Al2O3, MgO	HT A1	S44682