Effectiveness of Experimental Whitening Toothpastes Containing Colorants on the Optical Properties of Enamel

Table 2

Means and standard deviation (SD) of the whiteness index difference (ΔWI_D), color change difference (ΔE_ab), and CIEDE2000 color difference (ΔE₀₀) results as functions of ΔL, Δa, and Δb.

	ΔL	Δa	Δb	ΔWID	ΔEab	ΔE00	Rating and interpretation ΔEab	Rating and interpretation ΔE00
PHT	3.7 (2.0)	−1.2 (0.6)	3.4 (2.8)	8.4^A (4.2)	5.7^A (2.6)	3.8^A,C (1.6)	4	4
SDG	4.6 (1.5)	−1.3 (0.9)	3.4 (2.9)	9.0^A (6.0)	6.5^A (1.7)	4.3^A (1.2)	4	4
WRP	2.7 (1.2)	−1.0 (0.7)	3.7 (2.6)	7.7^A,C (4.1)	5.0^A,C (2.4)	3.0^B,C (1.2)	3	3
STW	2.5 (1.9)	−0.4 (0.4)	2.2 (2.4)	4.5^B,D (4.3)	4.1^B,C (2.0)	2.6^B,C,E (1.3)	3	3
SWS	1.9 (1.1)	−0.2 (0.6)	1.6 (1.5)	2.9^B (3.5)	2.9^B,D (1.3)	1.9^B,D,E (0.9)	3	3

N = 25 evaluated teeth per experimental group. Capital letters compare enamel color changes (ΔWI_D, ΔE_ab, and ΔE₀₀) at each time point (columns), according to one-way ANOVA and Tukey post hoc test (ΔWI_D, ΔE_ab, and ΔE₀₀). Different capital letters, A and B; C and D; E and F: significant (). Grades: (1) not effective; (2) moderately effective; (3) good effectiveness; (4) very good effectiveness; (5) excellent effectiveness [22].