Studies on the Carbon Dioxide Component of Human Enamel. III. The Effect of Neutral and Acid Fluoride

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Abstract
Addition of more than 1 ppm fluoride to pH 4.5 sodium and potassium acetate buffers increased the preferential CO2 removal from 18 m2/g enamel found with buffer. Fluoride alone at the same solid/solution ratios (100 mg/ 10 ml) did not remove CO2 preferentially. When calcium fluoride was not a major reaction product, almost equivalent portions of phosphate accompanied any CO2 removed in excess of that found in buffer alone. Furthermore, phosphate in the buffer supressed this effect. It was theorized that acid fluoride penetrates below the exposed crystal surface to remove additional CO2 as well as some phosphate.