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Related Experiment Videos

Methods for improving drug release from poly(methyl)methacrylate bone cement.

S Downes1

  • 1Institute of Orthopaedics, Stanmore, Middlesex, UK.

Clinical Materials
|December 10, 1990
PubMed
Summary

Poly(methylmethacrylate) (PMMA) bone cements can deliver therapeutic agents like antibiotics. Optimizing the polymer-to-monomer ratio and using crystalline drug formulations enhances drug release from these porous PMMA materials.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Poly(methylmethacrylate) (PMMA) is a versatile polymer utilized in dental and orthopedic applications.
  • PMMA-based acrylic cements form a porous matrix upon polymerization, suitable for therapeutic agent delivery.
  • Understanding drug release kinetics from PMMA is crucial for optimizing its clinical efficacy.

Purpose of the Study:

  • To investigate the release profiles of various therapeutic agents from PMMA bone cements.
  • To determine the influence of PMMA formulation, specifically the polymer-to-monomer ratio, on drug release.
  • To explore the impact of drug formulation (crystalline vs. powder) on release kinetics.

Main Methods:

  • Demonstration of therapeutic agent release (antibiotic, growth hormone, serum albumin) from PMMA.

Related Experiment Videos

  • Analysis of drug release mechanisms, characterized by initial rapid release followed by sustained release.
  • Correlation of PMMA polymer-to-monomer ratio with the extent of antibiotic release.

    • Main Results:

    • A biphasic release pattern (rapid followed by slow) was observed for all tested therapeutic agents.
    • Increased polymer-to-monomer ratio in PMMA formulations resulted in enhanced antibiotic release.
    • Crystalline drug formulations exhibited superior release performance compared to fine powders.

    Conclusions:

    • PMMA bone cements demonstrate potential as effective drug delivery systems.
    • Drug release from PMMA is significantly influenced by material formulation and drug physical state.
    • Optimized PMMA formulations and crystalline drug forms can improve therapeutic agent delivery in orthopedic and dental applications.