Table 2.

Intergroup and intragroup comparison of lightness values at various time intervals

	L values of Icon® resin infiltration	l values of Clinpro™ XT varnish	Intergroup comparison	Intragroup comparison
				Icon® resin infiltration	Clinpro™ XT varnish
T0	73.60 ± 7.71	74.62 ± 7.33	p = 0.295	T0 vs T1, p = 0.000**	T0 vs T1, p = 0.000**
T1	78.37 ± 5.94	78.93 ± 5.40	p = 0.446	T1 vs T2,p = 0.211	T1 vs T2, p = 0.003**
T2	80.08 ± 6.46	81.68 ± 5.55	p = 0.041*	T2 vs T3, p = 0.168	T2 vs T3, p = 0.069
T3	81.88 ± 6.27	83.69 ± 5.29	p = 0.017*	T0 vs T3, p = 0.000**	T0 vs T3, p = 0.000**
Adjacent sound enamel	81.67 ± 4.69	82.73 ± 4.66	p = 0.117	T3 vs adjacent sound enamel, p = 0.999	T3 vs adjacent sound enamel, p = 0.761

Statistical Tests: intergroup comparison—independent Student’s t test; intragroup comparison—one-way repeated measures ANOVA

L lightness, T₀ before intervention, T₁ immediate after intervention, T₂ 3 months, T₃ 6 months

*p < 0.05, **p < 0.01