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. 2015 Apr 27;1(1):29–34. doi: 10.3109/23337931.2015.1039537

Table 3. Means ± standard deviations of ΔE, ΔL, Δa and Δb values at the time point evaluated after whitening.

	ΔE		ΔL		Δa		Δb
Groups	6 weeks	12 weeks	6 weeks	12 weeks	6 weeks	12 weeks	6 weeks	12 weeks
DW	3.00 ± 2.20^a	2.48 ± 1.43^a	2.17 ± 2.29^a+	−0.39 ± 2.43^a+	−0.40 ± 0.52^ab+	0.27 ± 0.50^bcd+	−0.64 ± 1.85^a	0.22 ± 1.54^ab
SW	2.46 ± 1.69^a	3.26 ± 2.15^a	1.41 ± 2.31^a	1.17 ± 2.52^ab	−0.02 ± 0.40^bc	−0.08 ± 0.44^bc	−0.18 ± 1.34^a	−0.23 ± 2.88^ab
LWT	3.56 ± 1.88^ab	3.45 ± 2.92^a	1.75 ± 2.85^a	2.00 ± 2.05^b	−0.63 ± 0.80^a	−0.51 ± 0.66^a	−0.42 ± 2.19^a+	0.65 ± 4.12^b+
CWT	3.07 ± 1.64^a	3.08 ± 1.61^a	2.45 ± 2.15^a	2.55 ± 1.44^b	0.31 ± 0.59^c	0.39 ± 0.63^cd	0.16 ± 1.14^a	−0.18 ± 1.81^ab
CWR	5.17 ± 2.39^b	5.91 ± 2.81^b	4.89 ± 2.27^b	5.42 ± 2.88^c	0.39 ± 0.32^c	0.50 ± 0.38^cd	−0.91 ± 1.60^a	−1.66 ± 1.51^a
LWR	2.81 ± 1.06^a	3.14 ± 1.07^a	2.19 ± 1.36^a	2.19 ± 1.51^b	0.29 ± 0.35^c	0.61 ± 0.35^d	−0.65 ± 1.40^a	−0.99 ± 1.70^a
CWR + CWT	3.08 ± 1.53^a	3.61 ± 1.32^a	2.50 ± 1.39^a	2.90 ± 1.29^b	0.10 ± 0.32^bc	−0.21 ± 0.76^ab	−1.16 ± 1.55^a	−1.56 ± 1.38^a
LWR + LWT	2.89 ± 1.95^a	2.85 ± 1.83^a	2.35 ± 2.23^a	2.29 ± 2.63^b	−0.29 ± 0.89^ab	0.18 ± 0.79^ab	−0.63 ± 0.77^a	0.58 ± 1.41^ab

For a given time, different superscript lower letters indicate significant difference among groups.

⁺Statistical significant difference between 6 and 12weeks for each color parameter (p < 0.05).