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Variable polymerisation shrinkage and the interfacial micropermeability of a dentin bonding system.
B M Griffiths1, M Naasan, M Sherriff
1Department of Prosthetic Dentistry, Eastman Dental Institute and Hospital, London, UK.
The Journal of Adhesive Dentistry
|December 1, 2001
Summary
Setting stresses significantly impact dentin adhesive bonds. The study found that restoration material and placement technique critically affect interfacial integrity and microleakage, highlighting the importance of minimizing stress for durable dental restorations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Dental restorations are prone to stresses during setting.
- Understanding these stresses is crucial for adhesive bond longevity.
Purpose of the Study:
- To evaluate the impact of setting stresses on a dentin adhesive (Scotch Bond MultiPurpose Plus).
- To assess the morphology and micropermeability of the adhesive interface under different restorative conditions.
Main Methods:
- Utilized amalgam, light-cured, and chemically-cured composites in various thicknesses (bulk vs. thin layers).
- Restorations were placed in extracted molars and on sectioned teeth with a rigid matrix.
- Interfacial microleakage was quantified using rhodamine B dye and confocal microscopy.
Main Results:
- Light-cured composite showed significantly more leakage than amalgam and chemically-cured composite.
- Thin layers of light-cured composite on flat dentin minimized leakage.
- Incomplete polymerization and cohesive failure occurred with bulk placement, especially under low-intensity curing light.
Conclusions:
- Restoration setting stress is a critical factor influencing the microscopic integrity of the adhesive bond to dentin.
- Optimizing placement techniques can mitigate stress-induced bond degradation.