Table 2.

Percentages of measurements above detection limits^a for KOH-soluble and structurally bound fluoride in two successive layers in enamel specimens worn in intra-oral appliances at different sites and for different periods (days 0–6, days 0–1, days 1–2, days 3–4 or days 5–6) after the application of either Duraphat, Mirafluorid or no fluoride varnish (control) on the central specimen on day 0

		KOH-soluble F−			1st Layer (0–30 μm)			2nd Layer (31–60 μm)
Period	Site	Mirafluorid (%)	Duraphat (%)	Control (%)	Mirafluorid (%)	Duraphat (%)	Control (%)	Mirafluorid (%)	Duraphat (%)	Control (%)
0–6	Central	90	100	0	10	100	10	10	100	0
0–1	Next	10	60	0	0	30	0	0	30	0
0–1	1 cm	10	30	0	0	50	0	0	10	0
0–1	Opposite	0	0	0	0	10	0	0	0	0
1–2	Next	20	10	0	10	10	0	0	0	0
1–2	1 cm	20	0	0	0	0	0	0	0	0
1–2	Opposite	10	0	0	0	0	0	0	0	0
3–4	Next	10	0	0	0	10	0	0	0	0
3–4	1 cm	10	0	0	0	0	0	0	0	0
3–4	Opposite	10	0	0	0	0	0	0	0	0
5–6	Next	0	0	0	0	0	0	0	0	0
5–6	1 cm	10	0	0	0	0	0	0	0	0
5–6	Opposite	0	0	0	0	0	0	0	0	0

^aDetection limits (KOH-soluble F = 0.544 μg/cm², structurally bound fluoride = 604.8 μg/cm³)