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 / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Science (SCI)
Related URLs:	Publisher
Last Modified:	17 Oct 2016 09:11
URI:	http://gala.gre.ac.uk/id/eprint/7590

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