. 2019 Apr 25;12(8):1344. doi: 10.3390/ma12081344

Table 3.

Vickers hardness (kg/mm²) (median and interquartile range) after 0, 7 and 45 days of water immersion.

	Day Zero (Dry)	7-Days Water- Immersion	45 Days Water-Immersion
Weight Percent Zirconia	Vickers Hardness (kg/mm²) Median (IQR)	Vickers Hardness (kg/mm²) Median (IQR)	Vickers Hardness (kg/mm²) Median (IQR)
Control (0.0%)	17.6 (1.7) ^Aa	15.2 (2.0) ^Ab	15.5 (3.3) ^Ab*
1.5%	18.9 (3.2) ^Ab	17.7 (1.1) ^Ab	17.0 (1.8) ^Ab*
3.0%	19.6 (4.0) ^Ac	17.8 (1.2) ^Ac	17.3 (2.8) ^Ac
5.0%	21.1 (3.1) ^Ad	17.9 (2.9) ^Ad	17.1 (2.2) ^Ad*
7.0%	21.7 (3.0) ^Be	19.4 (0.9) ^Be	16.8 (2.3) ^Ae*
10.0%	22.9 (2.9) ^Bf	18.4 (3.3) ^Bf	16.3 (1.2) ^Af*

Within a column, values identified using similar upper-case letters are not significantly different from the control group value; within rows values identified using the same lower-case letters are not significantly different; asterisks indicate significant differences between day 0 and 45 days; N = 5 specimens per experimental group.