Solution Rate of Hydroxyapatite in Acetate Buffer Containing Low Concentrations of Foreign Ions

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Abstract
The weight loss of hydroxyapatite on exposure to 0.1 [image]/l acetate buffer (pH 4.2) was significantly reduced when certain foreign ions were introduced into the buffer. At concentrations of 0.2 m[image]/l, fluoride had the greatest influence in depressing the rate of solution; but Zn Pb, Sn++, Mo and Cd had an appreciable effect. Treated residues retained this protection when recycled in control buffer. Stannous and ZnF2 did not produce a summation of the separate effects of the metallic and fluoride ions in reducing the rate of dissolution. The protective effect of F, Zn and Sn++ tin which developed rapidly and was associated with withdrawal of these ions from the solution. The loss from the buffer of Zn and Sn++ was reduced in the presence of fluoride. The findings suggest that low concentrations of certain ionic species in the fruits surrounding the teeth may decrease acid dissolution of tooth mineral.