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Effect of two different restorative techniques using resin-based composites on microleakage
Ana Ceclia Corrêa Aranha1, Luiz André Freire Pimenta
1Department of Restorative Dentistry, Dental School of Piracicaba, University of Campinas, SP, Brazil.
American Journal of Dentistry
|May 21, 2004
Summary
This study found that both hybrid and packable resin composites showed microleakage in Class II cavities. Hybrid composites generally exhibited less microleakage than packable ones, highlighting challenges in sealing proximal margins.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials Engineering
Background:
- Microleakage remains a significant challenge in Class II resin composite restorations.
- Understanding the influence of material type, margin location, and insertion technique is crucial for improving restoration longevity.
Purpose of the Study:
- To compare the in vitro microleakage of hybrid (Tetric Ceram) and packable (Surefil) resin composites in Class II cavities.
- To evaluate the impact of margin location (enamel vs. dentin) and insertion technique (bulk vs. incremental) on microleakage.
Main Methods:
- Standardized Class II slot cavities were prepared in 100 bovine teeth with margins on enamel or dentin.
- Teeth were restored with Tetric Ceram or Surefil using bulk or incremental techniques.
- Restorations underwent 1000 thermocycles, methylene blue staining, and sectioning for microleakage assessment.
Main Results:
- All tested groups exhibited significant microleakage at both enamel and dentin margins.
- Hybrid resin composites demonstrated significantly less microleakage compared to packable composites, irrespective of insertion technique.
- For hybrid composites, margin location and insertion technique showed less pronounced differences in microleakage compared to packable composites.
Conclusions:
- Neither hybrid nor packable resin composites could entirely prevent microleakage in Class II cavities.
- The findings underscore the inherent difficulty in achieving a perfect seal at proximal margins, even with advanced restorative materials.