エナメル質におよぼすフッ化物洗口液の影響について

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タイトル別名
  • X-ray Diffraction Analysis of the Reaction of Fluoride Mouth-Rinsing Solution with Powdered Dental Enamel
  • エナメルシツ ニ オヨボス フッカブツ センコウエキ ノ エイキョウ ニ ツイ
  • 第1報 X線回折法による検討

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The present study was made to examine the effects of fluoride mouth-rinsing solutions on the enamel by X-ray diffractometry. Experiments were made in vitro of fluoride mouth-rinsing and fluoride topical application, with the powdered enamel as material; and the findings were compared. Phosphoric acid-acidified NaF solution (500 ppm of F-; pH 5.0) was used as the fluoride mouth-rinsing solution, and compared with the acidulated phosphate fluoride solution (F: 0.9%; pH 3.6) for topical applica tion.<BR>X-ray diffractometry was performed by the use of an automatic recording X-ray diffractometer to observe the crystallinity and identify the reaction products. For the observation of crystallinity, the half-maximum breadth (β1/2) was measured, and the values calculated from Scherrer's equation were defined as the parameters of crystallinity. The reaction products were studied by identification with the A.S.T.M. cards, observation of alterations in the diffraction line profiles and peak shifts at diffraction angles of 50-54 degrees (20), and by the relative graph of sinθ-βcosθ by Hall's analysis method.<BR>In the experiments of fluoride mouth-rinsing, the crystallinity was greatly increased, proving that a large amount of fluorapatite with considerably high crystallinity is produced. No CaF2 was detected in the rinsing experiment, while a large amount of CaF2 was produced in the topical application experiment, which shows that it is released with time.<BR>From the findings described above, it has been shown that in the reaction of the enamel with fluorides, not only fluorine concentration but also the method of application influences the reaction products. In other words, it is suggested that repeated applications of a low concentration of fluoride by mouth-rinsing with a fluoride solution over a long period will produce fluorapatite with high crystallinity without decalcifying the enamel, and thus will exert a favorable effect on enamelapatite.

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