Abstract
Information on chemical reactions of fluoride in topmost surface layers of dental enamel was obtained — in vitro — by analytical techniques with hyperfine depth resolution: electron spectroscopy combined with ion etching for depth profiling the chemical composition of surface layers and interference microscopy for measuring the depth of etching steps. From slightly acidic media, which are typical for some topical fluoride applications, the ion is taken up after apatite degradation in the form of calcium fluoride. Layers mixed of unreacted apatite and of calcium fluoride are formed. There is evidence that the calcium fluoride rich layer with less than 1 μm thickness, may contribute to the observed cariostatic effectiveness of fluorides. Only less attention has been paid till now to this effect.
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