The setting chemistry of glass ionomer cement
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The setting chemistry of glass ionomer cement was investigated by using mechanical determination of compressive strength at predetermined intervals, and measurement of structure changes of corresponding fracture sample by means of IR spectra and differential scanning calorimetry (DSC). Zinc polycarboxylate cement was used as a comparison sample. The compressive strength of glass ionomer cement (GIC) increases with aging. IR spectra and DSC of corresponding fracture sample show the structure changes of the matrix and interface layer comprising of silica gel during the predetermined intervals studied, however, no significant changes occur in the zinc polycarxyolate cement. Hence the structure changes of the matrix and or interface layer are responsible for compressive strength increasing with aging. The structure changes include the crosslink density, the ratio of complex form to ionic form, the content ratio of Al-PAA to Ca-PAA, the forming and maturing process of the interface layer comprising of silica gel.
Key wordsIR DSC glass ionomer cement compressive strength set reaction
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- Wasson EA and Nicholson JW. New Aspects of the Setting of Glass-ionomer Cements.J Dent Res., 1993, 72:481–483Google Scholar
- Matsuys S. IR and NMR Analyses of the Hardening and Maturation of Glass-ionomer Cement.J. Dent Res., 1996, 75: 1920–7Google Scholar
- Maeyer De EAP, Verbeeck RMH. Stoichometry of the caching Process of Fluoride-containing Aluminosilicate Glass-ionomer Glasses.J. Dent. Res., 1999, 78:1312–1318Google Scholar
- ISO 9917 (1991). International Standard. Dental Waterbased CementsGoogle Scholar
- Crisp S, Pringuer MA. Reaction in Glass Ionomer Cements: II: An Infrared Spectroscopic Study.J. Dent Res., 1974, 53: 1414–1419Google Scholar