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Related Experiment Videos

Lifetime predictions for resin-based composites using cyclic and dynamic fatigue.

J I McCool1, K G Boberick, G R Baran

  • 1Industrial and Management Engineering, Penn State Great Valley, 30 E. Swedesford Rd., Malvern, Pennsylvania 19355, USA.

Journal of Biomedical Materials Research
|April 25, 2001
PubMed
Summary

Dynamic fatigue testing overestimated dental composite lifetimes compared to cyclic fatigue. Silanization and aging significantly reduced predicted survival stresses, highlighting the importance of conservative testing methods for dental restorative materials.

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Area of Science:

  • Dental Materials Science
  • Mechanical Engineering
  • Biomaterials

Background:

  • Dental restorative materials are susceptible to fatigue failure during function.
  • Laboratory fatigue testing is crucial for predicting the in-vivo performance of dental composites.
  • Understanding material fatigue is essential for ensuring long-term restoration success.

Purpose of the Study:

  • To compare lifetime predictions from dynamic and cyclic fatigue testing methods.
  • To evaluate the influence of silanization on fatigue life predictions.
  • To assess the impact of aging on the fatigue performance of dental composites.

Main Methods:

  • Model composites with and without silanization were subjected to 4-point flexure fatigue testing.
  • Cyclic fatigue testing was performed at 5 Hz.

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  • Dynamic fatigue testing covered seven decades of stress rate application.
  • Crack propagation parameters were calculated to predict 5-year survival stresses.

    • Main Results:

    • Dynamic fatigue predicted approximately twice the survival stress compared to cyclic fatigue.
    • Absence of filler particle silanization halved the predicted survival stress.
    • Aging in a water-ethanol solution reduced survival stresses by a factor of four to five.

    Conclusions:

    • Cyclic fatigue provides a more conservative estimate of resin-based composite lifetimes.
    • Silanization is critical for maintaining fatigue resistance in dental composites.
    • Environmental aging significantly degrades the fatigue performance of dental restorative materials.