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Related Experiment Videos

A characterization of polymethylmethacrylate bone cement.

S S Haas, G M Brauer, G Dickson

    The Journal of Bone and Joint Surgery. American Volume
    |April 1, 1975
    PubMed
    Summary

    Polymethylmethacrylate (PMMA) cement properties, including handling and setting times, are significantly influenced by environmental factors and mixing. Material strength increases and residual monomer decreases over time, with observed shrinkage and porosity affecting its mechanical performance.

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    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Biomaterials Engineering

    Background:

    • Polymethylmethacrylate (PMMA) is a widely used polymer in various applications, including dental prosthetics.
    • Understanding the physical and chemical properties of PMMA cement is crucial for optimizing its performance and clinical outcomes.

    Purpose of the Study:

    • To comprehensively characterize the chemical composition, handling characteristics, and physical properties of PMMA cement.
    • To investigate the influence of environmental factors and processing techniques on key cement properties.

    Main Methods:

    • Characterization of PMMA cement including chemical composition, handling properties, and physical attributes.
    • Evaluation of factors such as environmental temperature and kneading on dough time, setting time, handling time, and temperature rise.

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  • Assessment of material aging effects on residual monomer content and strength.
  • Measurement of volume shrinkage and porosity.

    • Main Results:

    • Dough time, setting time, handling time, and temperature rise are highly sensitive to environmental temperature and kneading.
    • Material strength increases while residual monomer content decreases as the set PMMA cement ages.
    • Observed volume shrinkage up to 5% and porosity up to 10%, with porosity increasing upon rapid mixing.
    • Mechanical properties align with those of PMMA denture base materials.

    Conclusions:

    • Environmental temperature and kneading significantly impact PMMA cement handling and setting characteristics.
    • PMMA cement exhibits time-dependent improvements in strength and reduction in residual monomer.
    • Porosity and shrinkage are inherent properties influenced by mixing and aging, affecting overall mechanical integrity.