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Lookup NU author(s): Zhuoqun Yan, Dr Sharanbir Sidhu, Professor John McCabe
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This study was designed to determine the dimensional changes caused by thermal stimuli of glass ionomers with different glass/matrix ratios. Four cylindrical specimens were made for each of four powder/liquid ratios (3:1, 2.5:1, 2:1 and 1.5:1) for a conventional luting glass ionomer, two high viscosity restorative glass ionomers and a restorative resin-modified glass ionomer. The thermal characteristics were determined using a thermal mechanical analyzer (TMA) by heating the samples from 25°C to 70°C at 10°C per minute. All glass ionomers and the resin-modified glass ionomer lost water on heating. The results of the thermal response of these materials were explained in terms of the opposing effects of thermal expansion and desiccation on heating. The contraction on heating of glass ionomer and related materials was found to relate to the glass/matrix ratio but not directly proportional to it. Materials with lower P/L ratios contracted the most when heated to 70°C. The water loss from conventional and resin-modified glass ionomer with different glass/matrix ratios compensated for their thermal expansion and led to a minimal dimensional change when heated up to 50°C. This outcome may be interpreted as an example of smart behaviour of these materials. © 2007 Springer Science+Business Media, LLC.
Author(s): Yan Z, Sidhu SK, McCabe JF
Publication type: Article
Publication status: Published
Journal: Journal of Materials Science: Materials in Medicine
Year: 2007
Volume: 18
Issue: 6
Pages: 1163-1166
ISSN (print): 0957-4530
ISSN (electronic): 1573-4838
Publisher: Springer New York LLC
URL: http://dx.doi.org/10.1007/s10856-007-0153-y
DOI: 10.1007/s10856-007-0153-y
PubMed id: 17268863
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