Table 3. Means and standard deviations for ΔE_ab values of the dual-cured resin cements.

Resin cement	Shade	ΔEab
		1 h	24 h	30 days	180 days	1 year	2 years	3 years
NX3 Dual-cure	Clear	0.31 ± 0.12 aA	1.33 ± 0.32 aAB	2.78 ± 0.53 aBC	2.52 ± 0.85 aBC	2.40 ± 0.76 aBC	3.65 ± 0.74 aC	3.25 ± 0.74 aC
	White	0.52 ± 0.13 aA	1.47 ± 0.57 aAB	3.33 ± 1.41 abCD	2.56 ± 0.29 aBC	3.44 ± 0.41 aCD	4.50 ± 0.66 abD	3.51 ± 0.53 aCD
	Yellow	0.37 ± 0.23 aA	1.89 ± 0.39 aAB	2.33 ± 0.25 aBC	2.08 ± 0.67 aAB	2.02 ± 0.48 aAB	3.89 ± 0.95 abC	4.00 ± 1.02 abC
AllCem	Trans	0.56 ± 0.20 aA	2.35 ± 0.60 abAB	4.73 ± 1.66 bCD	3.80 ± 1.01 abBC	5.60 ± 0.45 bC	4.86 ± 1.17 abCD	4.52 ± 1.19 abCD
	A1	0.36 ± 0.11 aA	3.38 ± 0.48 bB	4.56 ± 0.42 bBC	5.98 ± 0.79 cC	7.29 ± 1.33 bCD	7.71 ± 1.47 cD	8.42 ± 1.75 cD
	A3	0.74 ± 0.30 aA	2.36 ± 0.52 abAB	3.52 ± 0.58 abBC	5.22 ± 1.53 bcCD	5.83 ± 1.30 bD	5.53 ± 1.21 bD	5.70 ± 1.24 bD

In each row, values followed by the same capital letters are statistically similar (p > 0.05). In each column, values followed by the same lowercase letters are statistically similar (p > 0.05).