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Stoichiometry of the Leaching Process of Fluoride-containing Aluminosilicate Glass-ionomer Glasses

Senior Research Assistant of the FSR-Flanders (Belgium)

R.M.H. Verbeeck

Department of Dental Materials Science, University Hospital, Institute for Biomedical Technologies (IBITECH), University of Ghent, De Pintelaan 185, B-9000 Ghent, Belgium

C.W.J. Vercruysse

Department of Dental Materials Science, University Hospital, Institute for Biomedical Technologies (IBITECH), University of Ghent, De Pintelaan 185, B-9000 Ghent, Belgium

Dental glass-ionomer cements (GIC) set by an acid-base reaction between a polyalkenoic acid and an ion-leachable glass. The exact relationship between the glass composition and the setting and final properties of GIC is not yet fully elucidated. As part of a systematic study of this relationship, we studied the leaching stoichiometry of glasses used in commercial formulations to correlate the glass composition with its leaching properties. The leaching experiments were performed in acetic acid solutions at pH = 3.4 by means of a pH-stat method. After predetermined time intervals, the suspension was filtered and the filtrate was analyzed for the glass constituents. The usefulness of the pH-stat method for the determination of glass reactivity was corroborated. The deviation of the leaching stoichiometry with respect to the pure glass stoichiometry decreased with increasing relative content of mono- and bivalent glass network dwellers and modifiers. Indications were found that the latter can be leached out independently and preferentially, while the leaching of network dwellers is coupled with the aluminum release. The F content as well as the reactivity of the glass affect the amount of fluoride available for release from a set GIC. It could be concluded that the leaching stoichiometry of GIC glasses can be correlated with their absolute and relative composition.

Key Words: glass-ionomer cement • leaching stoichiometry • glass reactivity • glass composition

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Journal of Dental Research, Vol. 78, No. 7, 1312-1318 (1999)
DOI: 10.1177/00220345990780070501


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by De Maeyer, E.A.P. Articles by Vercruysse, C.W.J. Search for Related Content PubMed PubMed Citation Articles by De Maeyer, E.A.P. Articles by Vercruysse, C.W.J. Social Bookmarking                         What's this?