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Damage modes in dental layer structures.

Y G Jung1, S Wuttiphan, I M Peterson

  • 1Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Journal of Dental Research
|May 18, 1999
PubMed
Summary
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Dental restorations and natural teeth are layered structures. This study reveals substrate properties significantly influence damage patterns and failure modes in bilayer composites, highlighting damage-tolerant designs.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Fracture Mechanics

Background:

  • Natural teeth and dental restorations are layered structures.
  • Understanding contact-induced damage in these layered composites is crucial for clinical success.
  • Coating thickness and elastic/plastic mismatch are hypothesized key factors.

Purpose of the Study:

  • To examine the hypothesis that coating thickness and coating/substrate mismatch influence contact-induced damage.
  • To investigate crack patterns in clinically relevant bilayer composites simulating tooth and crown structures.
  • To evaluate the role of substrate properties in damage evolution and failure.

Main Methods:

  • Studied two model bilayer systems: porcelain on alumina (soft/hard) and glass-ceramic on resin composite (hard/soft).

Related Experiment Videos

  • Utilized Hertzian contacts to analyze fracture damage evolution with varying contact load and coating thickness.
  • Employed finite element modeling to assess tensile stresses causing crack initiation.

    • Main Results:

    • Radically different crack patterns observed between the two systems.
    • Porcelain coatings showed surface-initiated cone cracks; glass-ceramic coatings exhibited surface and interface-initiated transverse cracks.
    • Substrate significantly influenced damage evolution, but both systems demonstrated damage tolerance with wide load ranges for failure.

    Conclusions:

    • Substrate properties profoundly impact damage evolution and failure modes in bilayer dental composites.
    • The studied bilayer systems exhibit damage-tolerant characteristics.
    • Findings have clinical relevance for designing durable dental restorations.