Table 2.

Differences in chromatic changes (△L, △a, △b, △E) of WSLs between the various groups (n = 10)

Time		R-Bl	Bl-R	R	ANOVA comparison		Multiple comparison
							R-Bl vs. Bl-R	R-Bl vs. R	Bl-R vs. R
		Mean ± SD			F Value#	P Value#	P Value¶
ΔL	T0 to T2	5.626 ± 3.703	2.150 ± 2.296	-0.060 ± 6.763	2.036	0.1556	0.2503	0.1408	0.7275
	T0 to T3	2.258 ± 3.730	-0.901 ± 5.596	0.940 ± 4.530	4.851	*	0.3176	0.8037	0.7049
Δa	T0 to T2	-1.049 ± 1.236	0.006 ± 1.147	-0.116 ± 0.921	2.165	0.1396	0.2155	0.2382	0.9699
	T0 to T3	-1.380 ± 1.084	0.103 ± 0.520	0.346 ± 0.659	11.150	*	*	*	0.6965
Δb	T0 to T2	-3.775 ± 1.450	-3.274 ± 2.230	-0.578 ± 1.786	6.821	*	0.8594	*	0.0466
	T0 to T3	-4.339 ± 1.553	-4.345 ± 2.209	-0.980 ± 1.907	8.276	*	> 0.9999	*	*
ΔE	T0 to T2	7.212 ± 3.528	5.829 ± 2.261	6.143 ± 2.654	0.513	0.6062	0.6305	0.7763	0.9649
	T0 to T3	6.096 ± 2.132	6.024 ± 2.704	4.515 ± 1.881	1.242	0.3092	0.9981	0.2898	0.4231

T0 (baseline), T1 (after demineralization), T2 (after treatment), T3 (after thermocycling)

#ANOVA;¶Tukey’s multiple comparisons test;

Level of significance level at <0.05