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Related Experiment Videos

Size effect in resin/glass composite flexure strengths.

G R Baran1, J I McCool, K G Boberick

  • 1Temple University School of Dentistry, Philadelphia, PA 19140, USA. Gbaran@dental.temple.edu

Journal of Oral Rehabilitation
|November 17, 1999
PubMed
Summary

Composite dental materials show a size effect in flexure strength due to their elastic-brittle nature. This study validated this effect and demonstrated the predictive power of the CARES/LIFE software for composite structures.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Mechanical Engineering

Background:

  • Composite restorative materials are widely used in dentistry.
  • Understanding their mechanical properties, such as flexure strength and size effect, is crucial for clinical success.
  • Previous research suggests a potential elastic-brittle behavior in these materials.

Purpose of the Study:

  • To test the hypothesis that composite restorative materials exhibit an elastic-brittle nature.
  • To investigate the presence and magnitude of a size effect on the flexure strength of dental composites.
  • To evaluate the predictive capability of the CARES/LIFE software for composite fracture strength.

Main Methods:

  • Fabrication of two sizes of composite flexure specimens (3.2x1.6x35 mm and 6.25x3.1x35 mm).

Related Experiment Videos

  • Testing fracture strengths using four-point bending tests.
  • Utilizing finite element analysis (ABAQUS) and statistical fracture mechanics (CARES/LIFE) to model and predict failure.
  • Soaking half the specimens in an ethanol:water solution to simulate environmental degradation.

    • Main Results:

    • Both soaked and unsoaked specimens exhibited Weibull behavior, indicating a size effect.
    • A significant detrimental effect of soaking on fracture strength was observed.
    • The CARES/LIFE methodology accurately predicted the observed size effect for both dry and soaked specimens.
    • Load-deflection data and Weibull parameters confirmed the elastic-brittle character of the composites.

    Conclusions:

    • Composite restorative materials demonstrate an elastic-brittle nature and a significant size effect on flexure strength.
    • Environmental degradation (soaking) negatively impacts composite strength.
    • The CARES/LIFE software shows strong potential for predicting failure probabilities in clinical dental applications.