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Microleakage of a composite inlay system.
J A Scott1, W P Saunders, R Strang
1Department of Conservative Dentistry, Glasgow Dental Hospital and School, Scotland, UK.
American Journal of Dentistry
|August 1, 1992
Summary
This study examined resin composite inlays, finding minimal leakage at enamel margins but significant leakage on dentin surfaces, even with dentin bonding agents. Few agents improved sealing compared to unfilled resin.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Dental restorations require effective marginal sealing to prevent microleakage.
- Dentin bonding agents aim to improve the seal between composite restorations and tooth structure.
- Evaluating the efficacy of different generations of dentin bonding agents is crucial for clinical success.
Purpose of the Study:
- To compare the marginal seal of resin composite inlays in dentin and enamel.
- To assess the performance of unfilled resin versus second and third generation dentin bonding agents.
- To quantify microleakage in standardized inlay preparations.
Main Methods:
- 135 human third molar teeth were prepared with standardized inlay cavities.
- Teeth were divided into 9 groups, treated with 8 dentin bonding agents or unfilled resin.
- Inlays were cemented, followed by water storage, thermocycling, and methylene blue dye penetration assessment.
Main Results:
- Minimal microleakage was observed at enamel margins across all groups.
- Significant microleakage occurred at dentin margins, even when dentin bonding agents were used.
- Only two dentin bonding agents showed superior performance compared to unfilled resin.
Conclusions:
- Current dentin bonding agents offer limited protection against microleakage at dentin margins for resin composite inlays.
- Enamel margins provide a more reliable seal than dentin margins in this study.
- Further advancements in dentin bonding technology are needed to achieve comparable sealing to enamel.