Table 4.

Intergroup and intragroup comparison of fluorescence loss (Q) values at various time intervals

	Q values of Icon® resin infiltration	Q values of Clinpro™ XT varnish	Intergroup comparison	Intragroup comparison
				Icon® resin infiltration	Clinpro™ XT varnish
T0	4.48 ± 1.42	4.60 ± 1.29	p = 0.498	T0 vs T1, p = 0.000**	T0 vs T1, p = 0.000**
T1	2.84 ± 1.53	3.14 ± 1.20	p = 0.094	T1 vs T2, p = 0.000**	T1 vs T2, p = 0.000**
T2	2.06 ± 1.05	2.05 ± 0.83	p = 0.935	T2 vs T3, p = 0.000**	T2 vs T3, p = 0.000**
T3	1.48 ± 0.81	1.51 ± 0.72	p = 0.767	T0 vs T3, p = 0.000**	T0 vs T3, p = 0.000**
Adjacent Sound Enamel	1.06 ± 0.58	1.08 ± 0.51	p = 0.80	T3 adjacent sound enamel, p = 0.050	T3 adjacent sound enamel, p = 0.016*

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

Q fluorescence loss, T₀ before intervention, T₁ immediate after intervention, T₂ 3 months, T₃ 6 months

*p < 0.05, **p < 0.01