Journal of Dental Hygiene Science

Table 4

Comparison of the Mean L* Values or Wine-Stained Tooth Specimens

Group	n	After 14 days of bleaching treatment	After anti-pigmentation treatment	After coloring treatment	p-value^†
G1_S+C*	6	-	71.42±1.94^A	43.2±6.90^B	0.002
G2_B+S+C	5	72.33±1.07^A	70.21±1.90^B	41.4±5.60^C	<0.001
G3_B+FV+S+C	4	72.53±1.72^A	71.62±1.16^A	39.3±7.70^B	<0.001
G4_B+RI+S+C	7	71.84±0.64^A	71.41±0.47^A	39.4±10.40^B	<0.001
G5_B+E+RI+S+C	7	72.50±1.20^A	71.61±0.81^A	30.7±10.00^B	<0.001
p-value^††		0.498	0.635	0.166

*In group 1, as a negative control group, whitening treatment was notperformed and only artificial saliva immersion and coloring treatment were performed.

^†p-value obtained by performing repeated measured ANOVA analysis.

^††p-value obtained by performing Kruskal–Wallis H analysis.

^A∼Crepresent the difference in L values after bleaching, treatment, and discoloration, respectively.

J Dent Hyg Sci 2022;22:156-63 https://doi.org/10.17135/jdhs.2022.22.3.156