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Related Experiment Videos

Margin failures in crown-like brittle structures: off-axis loading.

Chris Ford1, Tarek Qasim, Mark B Bush

  • 1School of Mechanical Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|August 19, 2007
PubMed
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Off-axis loading of dental crown models with compliant indenters, simulating food, promotes semi-lunar fractures. This fracture pattern, seen in dental crown failures, occurs at lower loads due to increased tensile stress at the dome margin.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials

Background:

  • Dental crowns are susceptible to fracture, with some all-ceramic failures exhibiting a characteristic semi-lunar pattern.
  • Previous studies on dental crown models focused on axial loading, limiting understanding of fracture mechanics under more complex loading conditions.

Purpose of the Study:

  • To investigate the effect of off-axis loading on crack initiation and propagation in dental crown-like dome structures.
  • To determine if off-axis loading can replicate the semi-lunar fracture pattern observed in clinical failures.

Main Methods:

  • Examined glass-epoxy resin dome structures subjected to off-axis loading (45 degrees) using compliant balsa wood and Teflon indenters.
  • Simulated food bolus interaction with the crown surface using soft indenters to spread contact.

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  • Employed finite element modeling to analyze stress distribution and identify crack initiation sites.

    • Main Results:

    • Off-axis loading with compliant indenters successfully initiated cracks at the dome margins, leading to a semi-lunar fracture pattern.
    • Soft indenters suppressed radial cracks originating from the undersurface, which are common under axial loading.
    • Finite element analysis revealed that off-axis loading significantly increased tensile stresses at the near-side dome margin.

    Conclusions:

    • Off-axis loading, particularly with compliant materials simulating food, is a critical factor in generating the semi-lunar fracture mode in dental crowns.
    • This loading condition substantially reduces the force required to induce this specific fracture pattern, offering insights into clinical crown failures.