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[Working time of bone cements].

H U Debrunner, A Wettstein

    Archiv Fur Orthopadische Und Unfall-Chirurgie
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Room temperature significantly impacts bone cement polymerization. Higher temperatures accelerate setting times by 1.5-2.0x, affecting working time and maximum temperature. Mechanical admittance offers objective measurement.

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    Area of Science:

    • Biomaterials Science
    • Polymer Chemistry
    • Orthopedic Surgery

    Background:

    • Bone cements are critical in orthopedic procedures.
    • Understanding their working and polymerization times is essential for surgical success.
    • Current methods for assessing these times can be subjective.

    Purpose of the Study:

    • To measure the working and polymerization periods of four common bone cements.
    • To investigate the influence of room and conditioning temperatures on these periods.
    • To evaluate mechanical admittance as an objective measure for determining the end of the working period.

    Main Methods:

    • Subjective assessment of applicability during polymerization for four bone cements (Sulfix-6, CMW, Simplex, Palacos).
    • Simultaneous measurement of cement temperature and mechanical admittance (750 Hz oscillation transfer).

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  • Experiments conducted at varying room and conditioning temperatures.

    • Main Results:

    • Working-up and polymerization periods are highly dependent on room temperature.
    • A 10°C increase in temperature accelerates polymerization by 1.5 to 2.0 times.
    • Higher room temperatures lead to increased maximum polymerization temperatures.
    • Mechanical admittance provides an objective method for assessing the working period.

    Conclusions:

    • Room temperature is a critical factor influencing bone cement working and polymerization times.
    • Mechanical admittance shows promise for objective, standardized determination of bone cement set times.
    • A proposal is made for improved ISO standards regarding the determination of the working-up period end.