Table 1.

Summary of used materials

Materials names	Manufacturer	Composition	Code
Ceram X	Dentsply-Sirona, Konstanz, Germany	Composite	Material 1
IPS e.max	Ivoclar Vivadent, Schaan, Lichtenstein	Ceramics	Material 2
Lava Plus	3 M, Neuss, Germany	Ceramics	Material 3
Vita Enamic	Vita, Bad Säckingen, Germany	Ceramics	Material 4
CoCrMo	AmannGirbach, Koblach, Austria	Metal alloy	Material 5
Enamel		Hydroxyapatite	Control