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Marginal morphology of Class V composite restorations
C Prati1, S Chersoni, L Cretti
1School of Dentistry, University of Bologna, Italy. C.Prati@mbox.queen.it
American Journal of Dentistry
|April 2, 1998
Summary
SEM analysis revealed that resin composites and glass ionomer cements create defects at enamel and dentin margins. Glass ionomers exhibited fewer marginal defects compared to resin composites in Class V restorations.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Class V restorations are susceptible to marginal defects.
- Evaluating the marginal integrity of different restorative materials is crucial for clinical longevity.
Purpose of the Study:
- To assess the SEM morphology of enamel and dentin margins in Class V restorations.
- To compare microleakage between resin composites and glass ionomer cements.
Main Methods:
- Class V cavities prepared in extracted third molars.
- Restorations placed using various resin composites and glass ionomer cements.
- SEM examination of replicas and dye leakage evaluation.
Main Results:
- Enamel margins showed prism fractures, chips, and overhangs in ~30% of samples.
- Dentin margins exhibited gaps and interface fractures with resin composites.
- Glass ionomers presented similar but fewer defects at both enamel and dentin interfaces.
Conclusions:
- Both resin composites and glass ionomers can cause marginal defects.
- Glass ionomers appear to have a more favorable marginal integrity compared to resin composites in Class V cavities.