9 エナメル質表面に生じるフッ素反応生成物に関する研究 (第446回大阪歯科学会例会)

概要

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We investigated fluoride reaction products occurring on the surface of tooth enamel using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (ESCA). Enamel specimens 3 mm in diameter were prepared from extracted, caries-free human incisors. The surface of the enamel specimens was polished by standard methods and then treated with an acid phosphate fluoride solution (APF ; 9,000 ppm F, pH 3.4). After fluoride treatment, the surface was washed with 1 M KOH and distilled water. Although a large amount of globular materials was observed in the AFM images of the surface treated with APF, this material was eliminated by the KOH wash. Elimination of this material permitted detection of apatite crystals on the surface in the AFM images. Although ESCA analysis of the F and Ca spectra of the APF-treated enamel surface indicated the presence of calcium fluoride, both spectra ware altered after the KOH wash. In particular, the KOH wash shifted the peak position of the F spectrum to the low energy side. These results indicated that the materials produced by APF treatment were calcium fluoride in nature. After the materials were dissolved with KOH wash, fluorapatite might have formed on the enamel surface.
大阪歯科学会の論文
1996-03-25