Ta. Fuierer et al., A MINERALIZATION ADSORPTION AND MOBILITY STUDY OF HYDROXYAPATITE SURFACES IN THE PRESENCE OF ZINC AND MAGNESIUM IONS, Langmuir, 10(12), 1994, pp. 4721-4725
Although relatively small amounts of zinc and magnesium ions are known
to be incorporated into tooth enamel and bone minerals, they may have
a major influence on the mineralization kinetics. In this study, the
results of equilibrium adsorption of these ions on hydroxyapatite (HAP
) and electrophoretic mobility measurements suggest that at solution c
oncentrations of zinc ion above about 1 ppm, the formation of zinc pho
sphate (Hopeite) dominates the surface properties. In the presence of
zinc and magnesium ions, the constant composition growth of HAP is mar
kedly reduced and the results suggest a Langmuir-type adsorption of th
ese additives at active growth sites on the HAP crystals. Zinc ion is
one of the most effective of the simple metal ions in inhibiting HAP c
rystal growth.