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Consistent quasistatic and acoustic elasticity determination of poly-L-lactide-based rapid-prototyped tissue engineering scaffolds

Authors

  • Krzysztof W. Luczynski,

    1. Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13/E202, 1040 Vienna, Austria
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  • Tomasz Brynk,

    1. Faculty of Materials Science and Engineering, Warsaw University of Technology, Politechniki Square 1, 00-661 Warsaw, Poland
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  • Barbara Ostrowska,

    1. Faculty of Materials Science and Engineering, Warsaw University of Technology, Politechniki Square 1, 00-661 Warsaw, Poland
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  • Wojciech Swieszkowski,

    1. Faculty of Materials Science and Engineering, Warsaw University of Technology, Politechniki Square 1, 00-661 Warsaw, Poland
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  • Roland Reihsner,

    1. Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13/E202, 1040 Vienna, Austria
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  • Christian Hellmich

    Corresponding author
    1. Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13/E202, 1040 Vienna, Austria
    • Institute for Mechanics of Materials and Structures, Vienna University of Technology, Karlsplatz 13/E202, 1040 Vienna, Austria
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  • How to cite this article: Luczynski KW, Brynk T, Ostrowska B, Swieszkowski W, Reihsner R, Hellmich C. 2013. Consistent quasistatic and acoustic elasticity determination of poly-L-lactide-based rapid-prototyped tissue engineering scaffolds. J Biomed Mater Res Part A 2013:101A:138–144.

Abstract

This paper is concerned with reliable and physically sound elasticity determination of rapid-prototyped tissue engineering scaffolds made of poly-L-lactide (PLLA), with and without small portions of tricalcium phosphate (TCP) inclusions. At the level of overall scaffolds, that is, that of several millimeters, multiple uniaxial loading–unloading (quasistatic) tests were performed, giving access to the scaffolds' Young's moduli, through stress–strain characteristics during unloading. In addition, acoustic tests with 0.05 MHz frequency delivered an independent access to elastic properties, in terms of the normal components of the scaffolds' stiffness tensors. The latter strongly correlate, in a linear fashion, with the Young's moduli from the unloading tests, revealing porosity independence of Poisson's ratio. The magnitude of the latter is in full agreement with literature data on polymers. Both of these facts underline that both ultrasound tests and quasistatic unloading tests reliably provide the elastic properties of tissue engineering scaffolds. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 101A:138–144, 2013.

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