Abstract
Surface enamel was treated with various fluorides at pH 4.0, 5.0 and 6.0. After treatment, the kinetics of acid-induced surface removal were determined. Drastically reduced rates of surface etching were observed after treatments inducing precipitation of calcium fluoride. The effect was less pronounced after stannous fluoride treatment, which generated a complex tin precipitate of unknown chemical composition. The treatments with the nearly neutral solutions of sodium fluoride and sodium monofluorophosphate were without measurable effect on the acid susceptibility of surface enamel.
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