Changes in the crystallinity of hydroxyapatite powder and structure of enamel treated with several concentrations of ammonium hexafluorosilicate

Toshiyuki Suge, Kunio Ishikawa, Takashi Matsuo

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

Purpose: To evaluate the effects of changing concentrations of ammonium hexafluorosilicate [SiF: (NH4)2SiF6] solution on the crystallinity of hydroxyapatite powder (HAP) and structure of human enamel in order to overcome the tooth discoloration caused by diamine silver fluoride [AgF: (NH3)2AgF] application. Methods: HAP was treated with several concentrations of SiF solution (from 10 to 19,400 ppm) for 5 minutes. The crystallinity of the HAP before and after SiF treatment was then measured by powder X-ray diffraction (XRD) analysis. The angular width (β) of the 002 diffraction peak was measured at 1/2 the height of the maximum intensity. Also, enamel specimens were prepared from a human extracted tooth. Several concentrations of SiF solution were applied to polished or phosphoric acid etched enamel specimens. The enamel surface was then observed using scanning electron microscopy (SEM). Results: XRD peaks became sharper after SiF treatment indicating that the crystallinity of apatite powder was increased. The 1/ß value was increased from 2.8 ±0.1 to 4.3 ± 0.1 after treatment with 1,000 ppm SiF solution. The amount of CaF2 formed in HAP was gradually increased with increasing concentrations of SiF solution. The XRD pattern was consistent with CaF2 in case of over 9,000 ppm SiF solution. SEM photographs demonstrated that exposed enamel rods with acid etching were filled with CaF2-like precipitate after SiF treatment regardless of the concentration of SiF solution.

本文言語英語
ページ(範囲)299-302
ページ数4
ジャーナルAmerican journal of dentistry
25
5
出版ステータス出版済み - 10 1 2012

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

フィンガープリント 「Changes in the crystallinity of hydroxyapatite powder and structure of enamel treated with several concentrations of ammonium hexafluorosilicate」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル