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Qualitative assessment of microstructure and Hertzian indentation failure in biocompatible glass ionomer cements

Qualitative assessment of microstructure and Hertzian indentation failure in biocompatible glass ionomer cements

Tian, Kun V., Nagy, Peter M., Chass, Gregory A., Fejerdy, Pal, Nicholson, John W., Csizmadia, Imre G. and Dobó-Nagy, Csaba (2012) Qualitative assessment of microstructure and Hertzian indentation failure in biocompatible glass ionomer cements. Journal of Materials Science: Materials in Medicine, 23 (3). pp. 677-685. ISSN 0957-4530 (Print), 1573-4838 (Online) (doi:10.1007/s10856-012-4553-2)

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Abstract

Discs of biocompatible glass ionomer cements were prepared for Hertzian indentation and subsequent fracture analyses. Specifically, 2 9 10 mm samples for reproducing bottom-initiated radial fracture, complemented by 0.2 9 1 mm samples for optimal resolution with X-ray micro tomography (lCT), maintaining dimensional ratio. The latter allowed for accurate determination of volumetric-porosity of the fully cured material, fracture-branching through three Cartesian axes and incomplete bottom-initiated cracking. Nanocomputed tomography analyses supported the reliability of the lCT results. Complementary 2-dimensional fractographic investigation was carried out by optical and scanning electron microscopies on the larger samples, identifying fracture characteristics. The combined 3-D qualitative assessment of microstructure and fractures, complemented by 2-D methods, provided an increased understanding of the mechanism of mechanical failure in these cements. Specifically, cracks grew to link pores while propagating along glass-matrix interfaces. The methodological development herein is exploitable on related biomaterials and represents a new tool for the rational characterisation, optimisation and design of novel materials for clinical service.

Item Type: Article
Additional Information: [1] Online First 29th January 2012
Uncontrolled Keywords: biocompatible glass ionomer cement, Hertzian indentation, X-ray micro tomography, Cartesian axes
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
T Technology > T Technology (General)
T Technology > TS Manufactures
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 17 Oct 2016 09:11
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/7590

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