Table 3.

Means ± standard deviation of CIE L*a*b* values measured before and after immersion in coffee. L* and b* values are significantly different for all restorative materials when comparing before and after immersion in coffee.

	CIE L*a*b* values
	Before			After
	L*	a*	b*	L*	a*	b*
Gradia	52.57 ± 1.25	0.72 ± 0.11	9.23 ± 0.79	49.36 ± 1.54	0.97 ± 0.18	11.70 ± 0.85
Filtek	61.27 ± 0.68	0.18 ± 0.09	12.22 ± 0.61	58.54 ± 0.95	0.11 ± 0.14	19.34 ± 1.19
CeramX	49.16 ± 0.92	2.21 ± 0.15	13.89 ± 0.83	46.28 ± 0.90	2.44 ± 0.18	16.04 ± 0.59
Admira	52.76 ± 0.69	−0.48 ± 0.07	7.81 ± 0.57	50.15 ± 0.52	0.10 ± 0.23	12.58 ± 1.16