Document Detail

New insights into structural alteration of enamel apatite induced by citric acid and sodium fluoride solutions.
MedLine Citation:
PMID:  18588337     Owner:  NLM     Status:  MEDLINE    
Attenuated total reflectance infrared spectroscopy and complementary scanning electron microscopy were applied to analyze the surface structure of enamel apatite exposed to citric acid and to investigate the protective potential of fluorine-containing reagents against citric acid-induced erosion. Enamel and, for comparison, geological hydroxylapatite samples were treated with aqueous solutions of citric acid and sodium fluoride of different concentrations, ranging from 0.01 to 0.5 mol/L for citric acid solutions and from 0.5 to 2.0% for fluoride solutions. The two solutions were applied either simultaneously or consecutively. The citric acid-induced structural modification of apatite increases with the increase in the citric acid concentration and the number of treatments. The application of sodium fluoride alone does not suppress the atomic level changes in apatite exposed to acidic agents. The addition of sodium fluoride to citric acid solutions leads to formation of surface CaF2 and considerably reduces the changes in the apatite P-O-Ca framework. However, the CaF2 globules deposited on the enamel surface seem to be insufficient to prevent the alteration of the apatite structure upon further exposure to acidic agents. No evidence for fluorine-induced recovery of the apatite structure was found.
Xiaojie Wang; Arndt Klocke; Boriana Mihailova; Lubomira Tosheva; Ulrich Bismayer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-06-28
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  112     ISSN:  1520-6106     ISO Abbreviation:  J Phys Chem B     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-07-18     Completed Date:  2008-11-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8840-8     Citation Subset:  IM    
Institute of Mineralogy and Petrology, Department of Earth Sciences, University of Hamburg, Grindelallee 48, D-20146 Hamburg, Germany.
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MeSH Terms
Calcium / chemistry,  metabolism
Calcium Fluoride / chemistry,  metabolism
Cariostatic Agents / pharmacology*
Citric Acid*
Dental Enamel / chemistry*,  metabolism
Durapatite / chemistry*,  metabolism
Fluorides / pharmacology*
Hydrogen-Ion Concentration
Microscopy, Electron, Scanning
Oxygen / chemistry,  metabolism
Phosphorus / chemistry,  metabolism
Sodium Fluoride*
Solutions / chemistry
Spectrophotometry, Infrared
Tooth Erosion* / chemically induced,  pathology,  prevention & control
Water / chemistry
Reg. No./Substance:
0/Cariostatic Agents; 0/Fluorides; 0/Solutions; 1306-06-5/Durapatite; 7440-70-2/Calcium; 7681-49-4/Sodium Fluoride; 77-92-9/Citric Acid; 7723-14-0/Phosphorus; 7732-18-5/Water; 7782-44-7/Oxygen; 7789-75-5/Calcium Fluoride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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