. 2023 Dec;57(4):300–315. doi: 10.15644/asc57/4/2

Table 3. Changes of color by ΔE00, ΔE*ab, and ΔWID by the group in different periods.

Color measures	Whitening product			p-value
Color measures	WT	WP	WT+WP	p-value
ΔE_ab(T1-T0)	1.76 (1.00-3.13)^a,b,A	3.73 (2.23-6.00)^a,A,C	3.78 (2.57-5.64)^b,A,C	≤0.001*
ΔE_ab(T2-T0)	1.97 (1.26-3.15)^a,b,A,B	4.55 (2.49-6.94)^a,A,B	4.27 (2.86-6.19)^b,A;B	≤0.001*
ΔE_ab(T2-T1)	1.42 (0.81-2.25)^B	1.58 (0.91-2.53)^B,C	1.64 (0.98-2.56)^B,C	0.358
p-value	≤0.001*	≤0.001*	≤0.001*
ΔE_00(T1-T0)	1.10 (0.63-1.99)^a,b,A	2.38 (1.33-4.00)^a,A,C	2.55 (1.61-3.88)^b,A,C	≤0.001*
ΔE_00(T2-T0)	1.22 (0.81-2.11)^a,b.A,B	2.88 (1.58-4.41)^a,A,B	2.80 (1.94-3.99)^b,A	≤0.001*
ΔE_00(T2-T1)	1.07 (0.57-1.73)^B	1.26 (0.70-1.93)^B,C	1.28 (0.80-2.12)^A,C	0.230
p-value	≤0.001*	≤0.001*	≤0.001*
ΔWI_D(T1-T0)	0.25 (-0.62-1.39)^a,b,A	2.80 (1.29-4.80)^a,A,C	2.85 (0.93-4.11)^b,A,C	≤0.001*
ΔWI_D(T2-T0)	1.17 (-0.12-2.02)^a,b,A,B	3.16 (1.64-4.77)^a,A,B	3.16 (1.61-4.75)^b,A,B	≤0.001*
ΔW_D(T2-T1)	0.44 (-0.26-1.76)^B	0.37 (-0.65-1.08)^B,C	0.32 (-0.62-1.53)^B,C	0.362
p-value	≤0.001*	≤0.001*	≤0.001*
Values are shown as median and interquartile range. The same lowercase letter in a row indicates statistical significance between different teeth whitening agents and same capital letters indicate a significant difference among the evaluation periods (p˂0.05). Abbreviations: T0 - before treatment; T1 - 7 days after the commencement of use; T2 -14 days after the commencement of use; WT – whitening toothpaste, WP – whitening pen, WT + WP – whitening toothpaste and pen.