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The dentinal surface: its influence on dentinal adhesion. Part I.
J D Eick1, C M Cobb, R P Chappell
1Department of Oral Biology, University of Missouri-Kansas City, School of Dentistry 64108.
Quintessence International (Berlin, Germany : 1985)
|December 1, 1991
Summary
First-generation dentin adhesives showed poor wetting and penetration, leading to low shear bond strength. Failures occurred at the interface or within the adhesive material itself.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
Background:
- Categorization of dentinal adhesives based on shear bond strength (MPa) is proposed: Category I (5-7 MPa), Category II (8-14 MPa), and Category III (up to 20 MPa).
- First-generation dentin adhesives represent an early stage in the development of dental bonding agents.
Purpose of the Study:
- To evaluate the performance of Category I, first-generation dentin adhesives.
- To present microscopic analysis of the dentinal smear layer and adhesive interfaces.
Main Methods:
- Photomicrography of the dentinal smear layer.
- Assessment of three Category I, first-generation dentin-adhesive interfaces.
- Shear bond strength testing of Category I adhesives.
Main Results:
- Photomicrographs revealed inadequate wetting and penetration of first-generation dentin adhesives.
- Shear bond strength testing showed failures occurring at the interface or within the adhesive resin.
- The tested Category I adhesives did not achieve high shear bond strengths.
Conclusions:
- First-generation dentin adhesives exhibit limitations in achieving optimal bonding due to poor interfacial interaction.
- Further research on Category II and III adhesives is necessary to understand improved wetting and performance.