Document Detail

Evidence of chemisorption of maleic acid to enamel and hydroxyapatite.
MedLine Citation:
PMID:  15279656     Owner:  NLM     Status:  MEDLINE    
Maleic acid has been used as an etchant or non-rinse conditioner in adhesive dentistry. However, the inherent mechanisms of the interaction of maleic acid with hydroxyapatite/enamel have never been fully elucidated. The purpose of this study was to provide evidence for the chemisorption of maleic acid onto hydroxyapatite/enamel, and to identify the reaction products obtained following the interaction of maleic acid with hydroxyapatite. Hydroxyapatite particles were dissolved in a 15% (w/v) aqueous solution of maleic acid (pH = 0.98). Half of the solution was dried to obtain a desiccated mixture. This mixture, hydroxyapatite, maleic acid and self-prepared calcium maleate were analysed by X-ray diffraction (XRD). Acetone was added to the other half of the solution to obtain a precipitate. This precipitate, hydroxyapatite, maleic acid, unetched enamel and maleic acid-etched enamel were analysed by X-ray photoelectron spectroscopy (XPS). The precipitate was also analysed by (1)H NMR. A new binding energy, indicating carboxylate groups, was detected by XPS on the precipitate and maleic acid-etched enamel surface. XRD data indicated the formation of calcium maleate and calcium hydrogen phosphate after the reaction. NMR data revealed that one carboxylic group of maleic acid reacted with hydroxyapatite. Hence, maleic acid can chemisorb to hydroxyapatite and enamel via ionic interactions.
Baiping Fu; Jun Yuan; Weixin Qian; Qingyi Shen; Xuemei Sun; Matthias Hannig
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of oral sciences     Volume:  112     ISSN:  0909-8836     ISO Abbreviation:  Eur. J. Oral Sci.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-07-28     Completed Date:  2004-10-04     Revised Date:  2013-04-05    
Medline Journal Info:
Nlm Unique ID:  9504563     Medline TA:  Eur J Oral Sci     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  362-7     Citation Subset:  D; IM    
Department of Stomatology, No. 1 Hospital affiliated to Medical College, Zhejiang University, Hangzhou, China.
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MeSH Terms
Acid Etching, Dental*
Calcium Phosphates / analysis
Crystallography, X-Ray
Dental Enamel / chemistry*
Durapatite / chemistry*
Electron Probe Microanalysis
Magnetic Resonance Spectroscopy
Maleates / analysis,  chemistry*
Spectrometry, X-Ray Emission
Reg. No./Substance:
0/Calcium Phosphates; 0/Maleates; 1306-06-5/Durapatite; 91XW058U2C/maleic acid; 97Z1WI3NDX/calcium phosphate

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