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Related Experiment Videos

Characterization of acrylic bone cement using dynamic mechanical analysis.

J M Yang1, H M Li, M C Yang

  • 1Department of Chemical Engineering, Chang Gung University, Tao-Yuan, Taiwan, Republic of China. jmyang@cguaplo.cgu.edu.tw

Journal of Biomedical Materials Research
|February 24, 1999
PubMed
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The addition of tricalcium phosphate (TCP) to acrylic bone cement can cause incompatibility, but this can be improved by including hydroxyethyl methacrylate (HEMA) and ethylene glycol dimethacrylate (EGDMA). Dynamic mechanical analysis (DMA) revealed these effects on cement properties.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Orthopedic Materials

Background:

  • Acrylic bone cements are widely used in orthopedic surgery.
  • Understanding the mechanical properties and long-term stability of bone cements is crucial for patient outcomes.
  • Investigating material additives like tricalcium phosphate (TCP) is important for improving cement performance.

Purpose of the Study:

  • To characterize the dynamic mechanical properties of acrylic bone cement modified with tricalcium phosphate (TCP).
  • To evaluate the influence of TCP, hydroxyethyl methacrylate (HEMA), and ethylene glycol dimethacrylate (EGDMA) on cement behavior.
  • To assess the compatibility of TCP within the acrylic bone cement matrix.

Main Methods:

  • Dynamic mechanical analysis (DMA) was employed to measure the viscoelastic properties.

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  • Experiments were conducted across a range of temperatures and frequencies.
  • Analysis focused on glass transition temperature, modulus, and damping behavior.

    • Main Results:

    • Acrylic bone cement exhibited a glass transition temperature above 100°C with a stable modulus near body temperature.
    • Increasing TCP content broadened and lowered the damping peak, indicating incompatibility.
    • Damping peak shifts with frequency confirmed time-dependent relaxation processes.
    • The addition of HEMA and EGDMA ameliorated the incompatibility between TCP and acrylic bone cement.

    Conclusions:

    • Tricalcium phosphate (TCP) alone is incompatible with acrylic bone cement, negatively impacting its mechanical damping properties.
    • The combination of TCP with HEMA and EGDMA can mitigate the observed incompatibility issues.
    • DMA is a valuable tool for assessing the viscoelastic response and material compatibility in bone cement formulations.