. 2021 Apr 27;2021:6611173. doi: 10.1155/2021/6611173

Table 1.

Mean (SD) of color change (ΔE) and color coordinates (ΔL∗, Δa∗, and Δb∗).

Group		ΔL∗	Δa∗	Δb∗	ΔE
0.5 mm	NB	3.98 (1.6)^a	-2.44 (0.5)^a	-16.6 (2.9)^a	17.38 (2.6)^a
	BBP	9.19 (3.02)^b	-2.72 (1.1)^a	-14.3 (5.0)^a	17.85 (3.5)^a
	BAP	8.39 (4.7)^a,b	-3.2 (1.5)^a	-16.6 (5.5)^a	19.9 (3.6)^a,b

1.0 mm	NB	4.68 (3.3)^a,c	-3.5 (1.1)^a	-18.2 (4.5)^a	19.6 (3.8)^a,b
	BBP	8.57 (4.1)^c,b	-2.87 (0.8)^a	-17.6 (1.8)^a	20.13 (2.4)^a,b
	BAP	13.2 (2.4)^d,b	-3.6 (0.9)^a	-18.2 (3.3)^a	22.99 (2.9)^b

NB = nonbleaching; BBP = bleaching before preparation; BAP = bleaching after preparation; SD = standard deviation. ^a–dIdentical letters indicate no significant differences (p ≤ 0.05, Tukey's test).