Interaction of fluoride complexes derived from glass-ionomer cements with hydroxyapatite

Lewis, Selma and Coleman, Nichola and Booth, Samantha and Nicholson, John W. (2013) Interaction of fluoride complexes derived from glass-ionomer cements with hydroxyapatite. Ceramics Silikaty, 57. pp. 196-200. ISSN 0862-5468

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Abstract

A study has been undertaken of the interaction of complexed fluoride extracted from glass-ionomer dental cements with synthetic hydroxyapatite powder. Extracts were prepared from two commercial glass-ionomers (Fuji IX and ChemFlex) under both neutral and acidic conditions. They were analysed by ICP-OES and by fluoride-ion selective electrode with and without added TISAB to decomplex the fluoride. The pH of the acid extracts was 4, conditions under which fluoridecomplexes with protons as HF or HF2, it also complexes with aluminium, which was found to be present in higher amounts in the acid extracts. Fluoride was found to be almost completely complexed in acid extracts, but not in neutral extracts, which contained free fluoride ions. Exposure of these extracts to synthetic hydroxyapatite powder showed that fluoride was taken up rapidly (within 5 minutes), whether or not it was complexed. SEM (EDAX) study of recovered hydroxyapatite showed only minute traces of aluminium taken up under all conditions. This showed that aluminium interacts hardly at all with hydroxyapatite, and hence is probably not involved in the remineralisation process.

Item Type: Journal Article
Uncontrolled Keywords: Hydroxyapatite; Stannous fluoride; Uptake; Anti-caries
Subjects: 500 Natural sciences & mathematics > 540 Chemistry
600 Technology > 610 Medicine & health
School/Department: School of Sport, Health and Applied Science
Depositing User: John Nicholson
Date Deposited: 14 Jan 2014 09:47
Last Modified: 14 Jan 2014 09:47
URI: http://research.stmarys.ac.uk/id/eprint/652

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