Fluoride Taken Up by Plaque, by the Underlying Enamel and by Clean Enamel from Three Fluoride Compounds in vitro

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Abstract
The interaction of F- with plaque and the underlying enamel was studied in an artificial mouth after topical application of 3 different F- solutions. Streptococcus mutans cells were grown on windowed bovine enamel blocks to form artificial plaque. Plaque-covered and clean enamel samples were rinsed with NaF, amine fluoride and Na-MFP [sodium monofluorophosphate] (200 ppm F-, twice a day for 10 min for 3 consecutive days). Amine fluoride and NaF caused F- increments in plaque (190 and 72 ppm); Na-MFP had no effect. In clean enamel the F- concentration increased with amine fluoride and NaF, but not with Na-MFP. Underneath plaque, the F- increments were higher than in clean enamel for all F- agents; the most pronounced difference could be seen with Na-MFP.