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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
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.
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.