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Related Experiment Videos

Destructive stresses in adhesive luting cements.

C L Davidson1, L Van Zeghbroeck, A J Feilzer

  • 1Department of Dental Materials Science, ACTA, Amsterdam, The Netherlands.

Journal of Dental Research
|May 1, 1991
PubMed
Summary

Shrinkage stress in dental cements varies with formulation and thickness. Thicker layers accelerate stress in glass-ionomers but slow it in composites, impacting material strength.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Dental luting cements are crucial for prosthetics.
  • Understanding shrinkage stress is vital for material longevity.
  • Glass-ionomers and BisGMA composites are common luting agents.

Purpose of the Study:

  • To investigate curing shrinkage stress development.
  • To compare stress in glass-ionomer and BisGMA composite luting cements.
  • To evaluate the effect of film thickness on stress development.

Main Methods:

  • Monitoring shrinkage stress development.
  • Adhesive placement of luting cements.
  • Varying film thicknesses from 30 to 200 microns.

Main Results:

  • Stress development depended on cement formulation and film thickness.
  • Thicker glass-ionomer layers showed faster stress development.
  • Thicker composite layers exhibited slower stress development.
  • Contraction stress negatively affected cohesive strength of glass-ionomer.
  • Contraction stress negatively impacted adhesive strength of composite cement.

Conclusions:

  • Film thickness significantly influences shrinkage stress in luting cements.
  • Material formulation dictates the response of stress development to thickness.
  • Shrinkage stress compromises the mechanical integrity of both glass-ionomer and composite luting cements.

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