Table 2.

Results of the QLF measurements: ΔQ (fluorescence loss [%] x area [mm²]) in various groups (SD: standard deviation).

Time	Group	Minimum	Maximum	Mean	Median	SD
After demin	I	− 38.40	− 0.25	− 3.29	− 1.51	6.43
	II	− 24.10	− 0.10	− 2.91	− 0.98	5.26
	III	− 12.00	− 0.01	− 1.57	− 1.15	2.10
ΔF T7d	I	− 31.50	− 0.03	− 6.45	− 3.65	6.96
	II	− 23.90	− 0.07	− 4.61	− 1.93	5.85
	III	− 15.70	0.00	− 1.46	− 0.40	3.08
ΔF T30d	I	− 13.70	− 0.05	− 3.00	− 1.13	3.86
	II	− 18.00	− 0.02	− 2.16	− 0.62	3.84
	III	− 0.31	0.00	− 0.06	− 0.03	1.17

Group I = no treatment.

Group II = single application of fluoride varnish.

Group III = application of P₁₁-4 + single application of fluoride varnish.