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

Tian, Kun V. and Nagy, Peter M. and Chass, Gregory A. and Fejerdy, Paol and Nicholson, John W. and Csizmadia, Imre G. and Dobo-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

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Official URL: http://dx.doi.org/10.1007/s10856-012-4553-2

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: Journal Article
Uncontrolled Keywords: Glass ionomer cements
Subjects: 500 Natural sciences & mathematics > 543 Analytical Chemistry
600 Technology > 610 Medicine & health
600 Technology > 631 Techniques, equipment & materials
School/Department: School of Sport, Health and Applied Science
Depositing User: John Nicholson
Date Deposited: 24 Sep 2012 09:50
Last Modified: 24 Sep 2012 09:50
URI: http://research.stmarys.ac.uk/id/eprint/197

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