Surface Characteristics of Hydroxyapatite and Enamel after Adsorption of Fluoride-Containing Macromolecules

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Abstract
The adsorption of 2 fluoride-containing polyelectrolytes with different hydrophobic properties on hydroxyapatite was investigated. The adsorption of the macromolecule was accompanied by fluoride uptake, but at a higher rate and with higher amounts than the polymer itself. The influence of the polyelectrolytes on the surface properties of hydroxyapatite and whole [human and bovine] enamel was investigated by .zeta. potential determinations and contact angle measurements, respectively. Adsorption of very minor amounts of these macromolecules had a remarkable effect on the .zeta. potential of hydroxyapatite. The original .zeta. potential of -9 mV was increased to relatively high positive values. Adsorption of the most hydrophobic polymer on the enamel resulted in a poor wettability of the surface by water. Contact angles .apprx. 90.degree. were observed, indicating the hydrophobic character of the treated surface.