P. Schaad et al., DISSOLUTION OF SYNTHETIC HYDROXYAPATITE IN THE PRESENCE OF LANTHANUM IONS, Journal of the Chemical Society. Faraday transactions, 90(22), 1994, pp. 3405-3408
Citations number
14
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Numerous cations exhibit strong interactions with dental or synthetic
hydroxyapatite (HAP) and of these, there are indications that lanthanu
m improves the acid resistance of these compounds. In the present stud
y, the reaction of La3+ ions with synthetic HAP in a water suspension
has been investigated. It has been demonstrated that these cations rea
ct with phosphate ions in equilibrium with HAP to form insoluble LaPO4
. This reaction releases protons which induce HAP dissolution up to it
s solubility equilibrium and to complete precipitation of La3+ ions. T
he kinetics of HAP dissolution at pH 5 with samples equilibrated for 2
h in the presence of 10 or 50 ppm LaCl3 show no differences compared
with pure HAP. This strongly suggests that La3+ ions added to HAP in w
ater suspension have no effect on the surface condition of this compou
nd.