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Loading rate and temperature as variables in amalgam bending.

M H Reisbick, A A Caputo

    Journal of Dental Research
    |August 1, 1977
    PubMed
    Summary
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    This study evaluated dental amalgams, finding that fracture stress at 140°F correlates with clinical fracture resistance. Creep may cause early marginal fractures before corrosion-induced damage occurs.

    Area of Science:

    • Materials Science
    • Dental Materials Science
    • Biomaterials Engineering

    Background:

    • Dental amalgam remains a widely used restorative material.
    • Understanding the mechanical properties and failure mechanisms of dental amalgams is crucial for clinical longevity.
    • Variability in clinical performance suggests differences in material properties and behavior under oral conditions.

    Purpose of the Study:

    • To evaluate three commercial dental amalgams with known differing clinical properties.
    • To compare their fracture resistance under various loading rates and temperatures.
    • To investigate the relationship between mechanical properties, creep, and fracture behavior.

    Main Methods:

    • Three commercial dental amalgams were subjected to pure blending.

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  • Evaluations were conducted at widely different loading rates and temperatures.
  • Fracture stress was measured at 140°F to assess clinical fracture resistance.

    • Main Results:

    • Comparative fracture stress data at 140°F ranked the alloys according to their clinical fracture resistance.
    • The phenomenon of creep was identified as a potential factor in early marginal fracture.
    • Creep may precede corrosion-induced fracture, influencing the material's overall integrity.

    Conclusions:

    • Fracture stress at 140°F serves as a reliable indicator of clinical fracture resistance for dental amalgams.
    • Material creep is a significant factor contributing to early marginal failures in dental restorations.
    • Understanding creep behavior is essential for predicting and preventing premature amalgam failure.