A photoacoustic FTIRS study of the chemical modifications of human dentin surfaces: I. Demineralization

被引：27

作者：

Di Renzo, M

Ellis, TH

Sacher, E

Stangel, I

机构：

[1] Univ Montreal, Dept Chim, Montreal, PQ H3C 3J7, Canada

[2] Ecole Polytech, Dept Genie Phys, Montreal, PQ H3C 3A7, Canada

[3] McGill Univ, Fac Dent, Montreal, PQ H3A 1A4, Canada

来源：

BIOMATERIALS | 2001年 / 22卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

dentin demineralization; acid etching; conditioning; photoacoustic infrared spectroscopy; chemical modifications;

D O I：

10.1016/S0142-9612(00)00240-4

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

Acids are used to modify the structure and composition of dentin surfaces to improve bonds formed with resins. The purpose of this work is to investigate such chemical modifications using the surface-sensitive technique photoacoustic Fourier transform infrared spectroscopy (PA-FTIRS). Spectra of acid-treated samples (citric, maleic, nitric, and phosphoric at pH = 1.0) were recorded at various time intervals. Analysis of these spectra indicates a gradual increase in sample surface area with treatment time. A decrease of the bands associated with calcium hydroxyapatite (HAP) and carbonate apatite inherent to the mineral phase of dentin an also observed. A comparison of spectra of samples treated for 2 min with each acid also reveals that maleic and phosphoric acids remove more HAP than citric acid. We conclude that citric acid may cause the formation of precipitates at the etching front which inhibit etching. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：787 / 792

页数：6

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