The reactions between solutions of sodium fluoride, acidulated sodium fluoride phosphate, and hydrofluoric acid and powdered dentin produced mainly calcium fluoride and residual hydroxyapatite. Treatment of powdered dentin with a 10% solution of stannous fluoride produced a new crystalline material identical to that previously described. The formation of fluorapatite on hydroxyapatite of powdered dentin could not be detected under the experimental conditions.
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