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Related Experiment Videos

Dimensional behavior of curing bone cement masses.

J R De Wijn, F C Driessens, T J Slooff

    Journal of Biomedical Materials Research
    |July 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

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    Bone cement expansion during curing may not improve prosthesis fixation. Laboratory tests show volumetric expansion can lead to linear shrinkage, questioning its clinical benefit for endoprostheses.

    Area of Science:

    • Biomaterials Science
    • Orthopedic Surgery
    • Polymer Chemistry

    Background:

    • Bone cement curing generates heat, causing expansion and monomer evaporation.
    • This expansion is believed to enhance the fixation of endoprostheses in bone marrow cavities.
    • Existing literature suggests a 3-5% volumetric expansion during bone cement polymerization.

    Purpose of the Study:

    • To investigate the influence of bone cement curing expansion on linear dimensions.
    • To determine if volumetric expansion during curing correlates with improved endoprosthesis fixation.

    Main Methods:

    • Bone cement was cured in precision stainless steel cylinders at 37°C.
    • Linear dimensions (diameter) of cured cement rods were measured.
    • Curing under elevated pressure (2 atm) was used to minimize porosity and study "foaming effect".

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    Main Results:

    • Volumetric expansion during curing was observed to be accompanied by linear diametrical shrinkage.
    • A linear thermal shrinkage of approximately 0.4% was measured after peak temperature.
    • High-pressure curing, minimizing porosity, led to expected shrinkage rather than expansion.

    Conclusions:

    • The volumetric expansion of bone cement occurs while it is still plastic, potentially forcing it longitudinally.
    • Subsequent cooling leads to thermal shrinkage, counteracting expansion effects.
    • The clinical benefit of bone cement expansion for endoprosthesis fixation is questionable, especially compared to hypothetical non-porous cements.