フッ化チタン化合物のエナメル質に及ぼす影響に関する研究
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The purpose of this study was to investigate the effect of the solutions of titanium fluoride compounds on human enamel. Experiments were performed in vitro, and solutions of (NH<SUB>4</SUB>) <SUB>2</SUB>TiF<SUB>6</SUB> (ammonium titanium fluoride, 9000ppmF<SUP>-</SUP>, pH 3.4) and SrTiF<SUB>6</SUB>·2H<SUB>2</SUB>O (strontium titanium fluoride, 9000ppmF<SUP>-</SUP>, pH 3.2) were applied to powdered enamel and intact enamel. APF solution was used for comparison with the titanium fluoride solutions.<BR>In the experiments with powdered enamel, the fluoride uptake from fluoride solutions and the estimation of the Ca/P mol ratio in enamel were examined by means of chemical analysis. X-ray diffractometry was performed by the use of an automatic recording X-ray diffractometer to observe the crystallinity and identify the reaction products in enamel following the application of fluoride solutions.<BR>In the experiments with intact enamel, electron probe X-ray microanalysis was carried out to determine the distribution of Ca, P, Mg, F, Ti and Sr in fluoride-treated intact enamel surfaces. An acid solubility test and scanning electron microscopic study were performed on these enamel surface.<BR>In the chemical analysis, the fluoride concentrations in powdered enamel were increased by the application of highly concentrated fluoride solutions. However, the Ca/P mol ratio of titanium fluoride-treated enamel was similar to that of control enamel. The chemical analysis and X-ray diffractometry showed that no CaF<SUB>2</SUB> was present in the titanium fluoride-treated enamel, while a large amount of CaF<SUB>2</SUB> was Produced in the APF-treated enamel. Furthermore, no other reaction products were found in the titanium fluoride-treated enamel and the enamel retained its hydroxyapatite structure. The crystallinity of enamel apatite was increased by the fluoride.<BR>In the electron probe X-ray microanalysis, the uptake of fluoride and titanium by the enamel surface was investigated in titanium fluoride-treated enamel and the uptake of strontium was seen in the strontium titanium fluoride-treated enamel. The acid solubility test proved the acquisition of high acid resistance by the enamel. Scanning electron microscopic study showed that there was glaze formation on enamel surfaces caused by the effect of titanium and that the acid-etched enamel surfaces after treatment with the titanium fluoride solutions had an acid-resistance picture.<BR>From these findings, it is suggested that ammonium titanium fluoride and strontium titanium fluoride seems are useful as agents for fluoride topical application in clinical use.
- 有限責任中間法人 日本口腔衛生学会の論文
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