Table 6.

The ∆E of the ceramic across 5 years.

	Day 0	1 Year	2 Years	3 Years	4 Years	5 Years
Day 0
1 Year	0.96 ± 0.6A
2 Years	1.34 ± 0.88aB	0.81 ± 0.52bA
3 Years	1.45 ± 0.84aB	0.96 ± 0.60bA	0.77 ± 0.45bA
4 Years	2.39 ± 0.97aC	2.09 ± 0.66acB	1.73 ± 0.51bB	1.86 ± 0.50bcA
5 Years	2.58 ± 2.18aC	2.26 ± 2.02acB	1.94 ± 2.05bB	2.12 ± 2.08bcA	0.98 ± 2.16dA

Lower case letters indicate significant difference within the row (p < 0.05).

Upper case letters indicate significant difference within the column (p < 0.05).