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Related Experiment Videos

Why do shear bond tests pull out dentin?

A Versluis1, D Tantbirojn, W H Douglas

  • 1Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis 55455, USA.

Journal of Dental Research
|June 1, 1997
PubMed
Summary
This summary is machine-generated.

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Dentin bond tests may overestimate adhesive strength due to stress concentrations. Numerical modeling revealed that cracks often form within dentin, not at the adhesive interface, necessitating new evaluation technologies.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Computational Mechanics

Background:

  • Traditional dentin shear bond tests assume pull-out indicates superior adhesive strength.
  • Previous numerical modeling highlighted significant stress concentrations in dentin bond testing.
  • These stresses may cause cracks within dentin, confounding interface strength assessment.

Purpose of the Study:

  • To test the hypothesis that high tensile stresses in dentin bond tests cause monolithic fracture.
  • To develop and validate a simulation program for analyzing failure in dentin bonding.
  • To re-evaluate the interpretation of dentin pull-out in bond strength testing.

Main Methods:

  • Developed a failure accumulation simulation program integrating finite element analysis.

Related Experiment Videos

  • Incorporated brittle behavior, adhesive/cohesive failure, stochastic response, and dynamic remeshing.
  • Validated simulation with experimental dentin bond tests and SEM fractography.

    • Main Results:

    • Simulation confirmed that tensile monolithic fracture within dentin is a primary failure mode.
    • Dentin pull-out is partly influenced by test biomechanics, not solely by adhesive or cohesive strength.
    • The study challenges the direct interpretation of pull-out as a measure of superior adhesive strength.

    Conclusions:

    • The conventional dentin shear bond test's interpretation requires revision due to stress concentration effects.
    • Numerical modeling is crucial for accurately interpreting experimental results of biological interfaces.
    • New technologies are needed for reliable evaluation of dentin-adhesive interfaces.