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Related Experiment Videos

Polymethylmethacrylate-based bone cement modified with hydroxyapatite.

C I Vallo1, P E Montemartini, M A Fanovich

  • 1Institute of Materials Science and Technology-INTEMA, (CONICET-UNMdP), Mar del Plata, Argentina.

Journal of Biomedical Materials Research
|May 20, 1999
PubMed
Summary
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Adding hydroxyapatite (HA) to bone cement enhances mechanical properties like fracture toughness and flexural modulus up to 15 wt%. This modification improved bone cement performance without affecting polymerization or residual monomer levels.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Orthopedic Research

Background:

  • Acrylic bone cements are widely used in orthopedic surgery.
  • Enhancing mechanical properties and fracture resistance of bone cements is crucial for implant longevity.
  • Hydroxyapatite (HA) is a biocompatible ceramic with potential to reinforce bone cements.

Purpose of the Study:

  • To investigate the effect of incorporating varying weight fractions of polycrystalline hydroxyapatite (HA) into a commercial acrylic bone cement.
  • To evaluate the influence of HA addition on the flow characteristics, mechanical behavior, and porosity of the bone cement composite.
  • To determine the optimal HA content for improved mechanical performance.

Main Methods:

  • Modification of acrylic bone cement with different weight fractions of HA.

Related Experiment Videos

  • Evaluation of rheological properties and workability.
  • Measurement of residual monomer content using gas chromatography.
  • Analysis of porosity morphology via optical and scanning electron microscopy.
  • Assessment of flexural, compressive, and fracture properties.

    • Main Results:

    • The degree of polymerization and residual monomer levels were unaffected by HA addition.
    • Increased HA content led to increased porosity and pore size in the hardened cement.
    • Up to 15 wt% HA incorporation resulted in enhanced flexural modulus and fracture toughness.
    • Workability limitations restricted HA incorporation to a maximum of 15 wt%.

    Conclusions:

    • Hydroxyapatite acts as a rigid filler, effectively enhancing the fracture resistance and flexural modulus of acrylic bone cement.
    • The optimal content for improved mechanical properties is 15 wt% HA, beyond which workability is compromised.
    • Modified bone cements with HA show potential for improved orthopedic applications.