Table 4.

Mean Vickers hardness numbers for dual-cure resin cement at different measurement depths indirectly irradiated under PRZ and PRA zirconia disks and directly light activated control group.

Measurement Depth (μm)	Zirconia type		Control	a p
	PRZ	PRA
	Mean±SD	Mean±SD	Mean±SD
100	62.53±7.53	66.46±8.45	124.22±5.42	<0.001 ∗
300	56.04±6.40	60.11±6.55	119.20±5.77	<0.001 ∗
500	46.31±7.01	52.88±6.81	100.43±3.75	<0.001 ∗
a p	<0.001 ∗	<0.001 ∗	<0.001 ∗
‡ 100 vs 300	<0.001 ∗	<0.001 ∗	0.051
‡ 100 vs 500	<0.001 ∗	<0.001 ∗	<0.001 ∗
‡ 300 vs 500	<0.001 ∗	<0.001 ∗	<0.001 ∗

^aOne-way ANOVA.  ^‡Bonferroni-corrected p-values.

PRZ: Prettau Zirconia; PRA: Prettau Anterior.

∗p<0.001.