Table 3. TP values and paired t-test results of materials between before and after glazing in 0.6 mm and 1.0 mm thickness.

Material	Not glazed		Glazed		P value	Increased percentage
	Mean	SD	Mean	SD
0.6 mm EM	30.37	1.31	35.07	1.53	.000*	15.48
0.6 mm ZP	33.03	1.79	34.10	1.43	.157	3.24
1.0 mm EM	19.77	2.05	21.76	2.75	.084	10.07
1.0 mm ZP	24.52	0.86	24.72	1.12	.652	0.82

EM: IPS e.max Press, ZP: IPS e.max ZirPress.

^*Significantly different compared to test groups (P < .05)