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Effects of test sample shape and surface production method on the fatigue behaviour of PMMA bone cement

Sheafi, E.M. and Tanner, K.E. (2014) Effects of test sample shape and surface production method on the fatigue behaviour of PMMA bone cement. Journal of the Mechanical Behavior of Biomedical Materials, 29(1), pp. 91-102. (doi: 10.1016/j.jmbbm.2013.08.023) (PMID:24070780)

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Publisher's URL: http://dx.doi.org/10.1016/j.jmbbm.2013.08.023

Abstract

There is no consensus over the optimal criterion to define the fatigue life of bone cement in vitro. Fatigue testing samples have been made into various shapes using different surface preparation techniques with little attention being paid to the importance of these variations on the fatigue results. The present study focuses on the effect of test sample shape and surface production method on the fatigue results. The samples were manufactured with two cross sectional shapes: rectangular according to ISO 527 and circular according to ASTM F2118. Each shape was produced using two methods: direct moulding of the cement dough and machining from oversized rods. Testing was performed twice using two different bone cements: SmartSet GHV and DePuy CMW1. At least 10 samples of each category were tested, under fully reversed tension-compression fatigue stress at ±20MPa, to allow for Weibull analysis to compare results. The growths of fatigue cracks were compared by means of the variations in energy absorption. It was found that fatigue crack growth can be altered by the sample shape and production method; however it is also dependent on the chemical composition of the cement. The results revealed that moulded samples, particularly those based on the ASTM F2118 standard, can lead to up to 5.5 times greater fatigue lives compared to the machined samples. It is thus essential, when comparing the fatigue results of bone cement, to consider the effect of production method along with the shape of the test sample.

Item Type:	Articles
Keywords:	Polymethylmethacrylate, bone cement, fatigue, sample shape, sample surface preparation method, Weibull analysis, absorbed energy.
Status:	Published
Refereed:	Yes
Glasgow Author(s) Enlighten ID:	Tanner, Professor Kathleen and Sheafi, Mr Emadeddin
Authors:	Sheafi, E.M., and Tanner, K.E.
Subjects:	T Technology > T Technology (General)
College/School:	College of Science and Engineering > School of Engineering
Research Group:	Cell and Tissue Engineering
Journal Name:	Journal of the Mechanical Behavior of Biomedical Materials
ISSN:	1751-6161
ISSN (Online):	1878-0180
Copyright Holders:	Copyright © 2014 Elsevier
First Published:	First published in Journal of the Mechanical Behavior of Biomedical Materials 29(1):91-102
Publisher Policy:	Reproduced in accordance with the copyright policy of the publisher

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Funder and Project Information

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
		PhD Studentship Libyan Government			UNSPECIFIED

References

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Deposit and Record Details

ID Code:	85005
Depositing User:	Professor Kathleen Tanner
Datestamp:	27 Sep 2013 13:28
Last Modified:	22 Sep 2021 17:21
Date of first online publication:	January 2014
Date Deposited:	15 December 2015