Fracture Strength of Aged Monolithic and Bilayer Zirconia-Based Crowns

Table 4

Mean yttrium content (wt%) in monolithic crowns and Tukey’s test results at 95% significance level.

Experimental group	Yttrium content (wt%)	Std. deviation	Tukey; ( = .05)
PM worn occlusal	2.0785	0.9361	a^*
GM worn occlusal	2.0822	0.6728	a
PM undamaged	2.0700	0.6443	a

^*Similar letters indicate statistically similar results among all groups ( = .935).