Abstract
The crystallinity of fluoridated CO3-apatites showed similar patterns of variation in the degree of fluoridation irrespective of carbonate content, although, on the whole, it was lower than that of fluoridated hydroxyapatites. In Mg-containing fluoridated hydroxyapatites, the patterns of crystallinity with the increase of fluoride content were unique in each series with different magnesium contents. In contrast to these unexpected crystallinity phenomena, the apparent solubility of fluoridated CO3-apatites and Mg-containing fluoridated hydroxyapatites decreased monotonically with the increasing degree of fluoridation, and approached that of fluoridated hydroxyapatites at a high fluoride content. Fe-containing fluoridated hydroxyapatites were more poorly crystallized than Fe-free fluoridated hydroxyapatites. Despite this inhibited crystallinity behavior, the apparent solubility decreased more than that of Fe-free fluoridated hydroxyapatites at a low fluoride content.
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