. 2015 Aug 20;2015:853975. doi: 10.1155/2015/853975

Table 2.

Mean ± standard deviation values of ΔE for all conditions tested. Values followed by the same letters are statistically similar (p > 0.05).

Material	Solution	Time	ΔE
Herculite Classic	Water	7 days	1.37 ± 0.36^ab
		30 days	1.83 ± 0.35^abc
		After polishing	1.59 ± 0.39^ab
	Cola	7 days	1.61 ± 0.32^ab
		30 days	1.97 ± 0.73^abc
		After polishing	1.73 ± 0.51^abc
	Coffee	7 days	1.33 ± 0.22^ab
		30 days	2.68 ± 0.71^cdefg
		After polishing	2.09 ± 0.48^abcde
	Wine	7 days	3.11 ± 0.72^defgh
		30 days	5.30 ± 1.36^k
		After polishing	2.36 ± 0.53^bcdef

Durafill VS	Water	7 days	1.18 ± 0.79^a
		30 days	2.36 ± 0.95^bcdef
		After polishing	2.11 ± 0.39^abcde
	Cola	7 days	1.68 ± 0.56^abc
		30 days	2.27 ± 0.23^bcdef
		After polishing	1.85 ± 0.36^abc
	Coffee	7 days	1.83 ± 0.44^abc
		30 days	3.81 ± 0.50^hij
		After polishing	2.27 ± 0.72^bcdef
	Wine	7 days	4.28 ± 0.51^ijk
		30 days	6.78 ± 1.03^l
		After polishing	4.09 ± 0.82^hij

Luna	Water	7 days	3.06 ± 0.57^defgh
		30 days	3.59 ± 0.35^ghi
		After polishing	2.12 ± 0.57^abcdef
	Cola	7 days	3.16 ± 0.47^fgh
		30 days	4.38 ± 0.37^ijk
		After polishing	1.47 ± 0.41^ab
	Coffee	7 days	3.04 ± 0.56^defgh
		30 days	4.85 ± 0.51^jk
		After polishing	1.45 ± 0.40^ab
	Wine	7 days	4.26 ± 0.62^ij
		30 days	8.07 ± 0.53^m
		After polishing	1.55 ± 0.67^ab