불화인회석 결정구조분석에 있어서 핵자기공명법의 응용
Application of MAS-NMR spectroscopy on the analysis of fluoroapatite in enamel
이영은, 백혜진, 구효진, 김종화, 안상헌, 송근배,
소속 상세정보
이영은 ( Lee Young-Eun ) - 경북대학교 치의학전문대학원 예방치과학교실
백혜진 ( Baek Hye-Jin ) - 경북대학교 치의학전문대학원 예방치과학교실
구효진 ( Gu Hyo-Jin ) - 경북대학교 치과대학 예방치과학교실
김종화 ( Kim Jong-Hwa ) - 한국기초과학지원연구원 대구센터
안상헌 ( Ahn Sang-Hun ) - 동국대학교 의과대학 치과학교실
송근배 ( Song Keun-Bae ) - 경북대학교 치의학전문대학원 예방치과학교실
KMID : 0355420090330040523
Abstract
Objective: This study examined the fluoroapatite present in the enamel using magic angle spinningnuclear magnetic resonance spectroscopy (MAS-NMR).
Methods: Twelve tooth (6 human and 6 bovine teeth) specimens were assigned to each of the following treatment groups; (1) 60 seconds Taste APF gel for 1 week (n=3) and (2) Cavity Shield varnish for 1 week (n=3). All the specimens were dried at 37℃ for 12 hours, powdered and analyzed. The powder specimens were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and 19F MAS-NMR.
Results: The broad range XRD patterns were in accordance with a typical hydroxyapatite pattern, and there were no changes in the apatite crystal structure. In the topical fluoride application group, the FT-IR spectra also revealed the typical vibration modes of apatite, and the spectrum was similar to the control. The 19F MAS-NMR peak at 100-120 ppm was observed in the 60 seconds Taste APF gel groups. The increasing peak area, height of the maximum peak and the full width half maximum suggest the incorporation of fluorine in the apatite crystal.
Conclusions: Topical fluoride application can alter the microstructure of the enamel through the incorporation of fluoride ions into hydroxyapatite crystals, and 19F MAS-NMR is a good technique for analyzing the fluoroapatite in enamel.
키워드
결정구조;불화인회석;핵자기공명법
crystal structure;fluoroapatite;magic angle spinning-nuclear magnetic resonance spectroscopy
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