エナメル質表層フッ素量とエナメル質溶解性との関係

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タイトル別名
  • Relationship between enamel solubility and fluoride concentration in the surface enamel
  • エナメルシツ ヒョウソウ フッソリョウ ト エナメルシツ ヨウカイセイ ト ノ

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1) The present study was undertaken to examine a relationship between the enamel solubility and the fluoride concentration in the surface enamel. Four succesive layers of the enamel of extracted human and bovine teeth were etched off by 0.5 M perchloric acid 2μl from the distal location of the buccal or labial tooth surface. Fluoride and calcium in each layer were examined by the fluoride ion electrode and the atomic absorption spectrophotometry, respectively. Enamel solubility was determined by measuring the amount of calcium in pH 2.3 sodium acetate-hydrochloric acid buffer dissolved from the mesial location of the same surface.<BR>2) The following fomula of the fluoride gradient concentration of the surface enamel was obtained from the above results:<BR>y=ax-b x: the depth (μm)<BR>y: the fluoride concentration (ppm)<BR>a; b: the constant of the examined surface enamel<BR>Using this equation, the comparison of the fluoride content between the samples was made.<BR>3) Enamel fluoride in the extracted tooth samples was as follows.<BR>Sample<BR>Fluoride concentration at 0.8 μm depth<BR>(mean±SE)<BR>human erupted upper central incisor 444±115 (ppm)<BR>human unerupted lower first premolar 267±87<BR>bovin erupted lower incisor 222±52<BR>4) APF solution treatment increased the fluoride concentration in the surface enamel of all teeth. Among teeth the human unerupted lower first premolar showed a most remarkable increase in fluoride concentration.<BR>5) The enamel solubility (mean and standard error of dissolved calcium amounts) was 3.11±0.5μg in the bovin lower incisor, 0.27±0.002μg in the human lower premolar, and 0.28±0.02μg in the human upper central incisor.<BR>6) There was a reverse relationship between fluoride concentration and enamel solubility in the surface enamel.

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