Table 3.

Means and standard deviations of CIE Lab parameters for the materials tested in the four solutions after 8 weeks of immersion. ΔL: changes in lightness and darkness, Δa: changes in the red–green axis, Δb: changes in the blue–yellow axis, ΔE: overall shade change.

Material	Solution	ΔL	Δa	Δb	ΔE
Filtek Z250XT	Tea	−1.3 ± 8.5	−0.3 ± 2.1	27.3 ± 3.7	28.3 ± 4.5 *
	Coffee	−10.2 ± 2.6	4.7 ± 1.8	10.1 ± 1.3	15.1 ± 3.0 *
	Berry juice	−3.4 ± 8.3	1.8 ± 1.0	4.2 ± 1.0	7.7 ± 6.2 *
	Distilled water	4.7 ± 8.1	0.4 ± 0.3	−1.0 ± 1.3	5.5 ± 7.6 *
IPS Empress-Direct	Tea	−12.0 ± 9.1	2.0 ± 4.0	16.6 ± 4.8	22.2 ± 6.0 *
	Coffee	−13.1 ± 3.9	5.9 ± 1.1	11.9 ± 2.5	21.4 ± 2.9 *
	Berry juice	0.5 ± 6.0	3.3 ± 0.5	7.6 ± 1.1	9.8 ± 1.7 *
	Distilled water	10.5 ± 5.4	0.6 ± 0.2	−0.8 ± 0.9	10.6 ± 5.5 *
G-ænial	Tea	−13.0 ± 5.4	5.6 ± 2.6	13.2 ± 1.5	19.7 ± 4.7 *
	Coffee	−13.2 ± 1.0	4.1 ± 0.4	9.3 ± 0.5	16.6 ± 0.9 *
	Berry juice	−2.9 ± 1.2	2.0 ± 0.7	4.5 ± 1.3	5.8 ± 1.2 *
	Distilled water	0.1 ± 1.4	0.2 ± 0.1	−1.4 ± 0.9	1.9 ± 0.7
Vit-l-escence	Tea	−13.9 ± 9.8	4.7 ± 5.7	13.4 ± 5.8	22.0 ± 6.9 *
	Coffee	−22.1 ± 9.8	7.2 ± 2.8	12.4 ± 1.6	26.9 ± 8.2 *
	Berry juice	12.8 ± 20.6	0.6 ± 1.3	3.0 ± 3.5	5.8 ± 3.7 *
	Distilled water	4.5 ± 1.8	0.1 ± 0.2	0.6 ± 0.6	4.6 ± 1.8 *
Ceram.X	Tea	−2.8 ± 1.5	1.7 ± 0.5	6.5 ± 1.7	7.3 ± 2.0 *
	Coffee	−4.8 ± 3.9	1.8 ± 0.9	4.1 ± 2.1	6.7 ± 4.3 *
	Berry juice	4.0 ± 2.8	1.2 ± 0.4	3.7 ± 1.7	6.0 ± 2.0 *
	Distilled water	7.4 ± 1.2	0.6 ± 0.2	0.3 ± 1.2	7.5 ± 1.3 *

* Change of ΔE ≥ 3.7 is considered visually detectable.