Effect of Sodium Fluoride, Stannous Fluoride, Amine Hydrofluoride and Sodium Monofluorophosphate on the Formation of Precipitates Adhering to Bovine Enamel

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Abstract
After in vitro treatment of surface enamel (bovine incisors) with aqueous solutions of various fluorides (pH 4.0, 5.0, 6.0) the elemental composition of the outermost zone was investigated by electron spectroscopy. In acidic solution (pH 4.0 and 5.0) calcium fluoride is the main reaction product. It precipitates on surface enamel and in prism pits. The exception is pH 4.0 stannous fluoride solution which has no degrading effect on surface enamel, a complex tin compound being precipitated. The nearly neutral applications (pH 6.0) had very little effect on the composition of surface enamel.