Abstract
Two types of heterogeneous fluoridated hydroxyapatites (H-FAp and F-HAp) with relatively lower crystallinity were synthesized at 60℃ and pH7.4, using the 2-step fluoride supply system. The fluoride content was similar in both heterogeneous fluoridated hydroxyapatites and was only half the maximal fluoride content of fluorapatite. X-ray diffraction analysis indicated that they had wider peak breadths of the (300) reflection, which were not so different from each other. However, the scanning electron microphotographs (SEM) were quite different from each other. Energy dispersive spectroscopy attached to the SEM gave clearly different spectra and the fluoride peak of H-FAp was higher than that of F-HAp. H-FAp had a lower apparent solubility after one-month incubation in 0.5 M acetate buffer solution (37℃, pH4.0). These results suggested that hydroxyapatite covered with fluorapatite (H-FAp) and fluorapatite covered with hydroxyapatite (F-HAp) might be formed.
