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Creep behavior of bone cement: a method for time extrapolation using time-temperature equivalence

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Abstract

The clinical lifetime of poly(methyl methacrylate) (PMMA) bone cement is considerably longer than the time over which it is convenient to perform creep testing. Consequently, it is desirable to be able to predict the long term creep behavior of bone cement from the results of short term testing. A simple method is described for prediction of long term creep using the principle of time–temperature equivalence in polymers. The use of the method is illustrated using a commercial acrylic bone cement. A creep strain of approximately 0.6% is predicted after 400 days under a constant flexural stress of 2 MPa. The temperature range and stress levels over which it is appropriate to perform testing are described. Finally, the effects of physical aging on the accuracy of the method are discussed and creep data from aged cement are reported.

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Authors and Affiliations

  1. Smith and Nephew Group Research Centre, Heslington, York, YO10 5DF, UK

    R. L. Morgan, D. F. Farrar, J. Rose, H. Forster & I. Morgan

Authors
  1. R. L. Morgan
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  2. D. F. Farrar
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  3. J. Rose
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  4. H. Forster
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  5. I. Morgan
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Morgan, R.L., Farrar, D.F., Rose, J. et al. Creep behavior of bone cement: a method for time extrapolation using time-temperature equivalence. Journal of Materials Science: Materials in Medicine 14, 321–325 (2003). https://doi.org/10.1023/A:1022927814801

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