Gjorgievska, Elizabeta, Van Tendeloo, Gustaaf, Nicholson, John W., Coleman, Nichola J., Slipper, Ian J. and Booth, Samantha (2015) The incorporation of nanoparticles into conventional glass-ionomer dental restorative cements. Microscopy and Microanalysis, 21 (2). pp. 392-406. ISSN 1431-9276 (Print), 1435-8115 (Online) (doi:https://doi.org/10.1017/S1431927615000057)

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Abstract

Conventional glass-ionomer cements (GICs) are popular restorative materials, but their use is limited by their relatively low mechanical strength. This paper reports an attempt to improve these materials by incorporation of 10 wt% of three different types of nanoparticles, aluminum oxide, zirconium oxide, and titanium dioxide, into two commercial GICs (ChemFil® Rock and EQUIA™ Fil). The results indicate that the nanoparticles readily dispersed into the cement matrix by hand mixing and reduced the porosity of set cements by filling the empty spaces between the glass particles. Both cements showed no significant difference in compressive strength with added alumina, and ChemFil® Rock also showed no significant difference with zirconia. By contrast, ChemFil® Rock showed significantly higher compressive strength with added titania, and EQUIA™ Fil showed significantly higher compressive strength with both zirconia and titania. Fewer air voids were observed in all nanoparticle-containing cements and this, in turn, reduced the development of cracks within the matrix of the cements. These changes in microstructure provide a likely reason for the observed increases in compressive strength, and overall the addition of nanoparticles appears to be a promising strategy for improving the physical properties of GICs.

Item Type:	Article
Uncontrolled Keywords:	glass-ionomer cement, nanoparticle, aluminum oxide, zirconium oxide, titanium dioxide
Subjects:	Q Science > QD Chemistry
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Science (SCI)
Last Modified:	20 Nov 2017 12:08
URI:	http://gala.gre.ac.uk/id/eprint/13183

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