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[Microleakage of four different amalgam binding systems].
T G Oberholzer1, S R Grobler, R J Rossouw
1Navorsingsinstituut vir Mond, en Tandheelkunde, Universiteit van Stellenbosch Suid-Afrika.
Summary
This study compared four dental bonding agents for amalgam restorations, finding no system completely prevented microleakage. Amalgambond Plus showed the most leakage, while Optibond Solo, Fuji Plus, and Prime & Bond 2.1 offered improved marginal seals.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Microleakage at the tooth-restoration interface is a primary cause of secondary caries and restoration failure.
- Effective marginal sealing is crucial for the longevity of amalgam restorations.
- Evaluating new bonding systems is essential for improving clinical outcomes.
Purpose of the Study:
- To compare the microleakage of Class V cavities lined with Amalgambond Plus with HPA, Optibond Solo, Fuji Plus, and Prime & Bond 2.1 before amalgam restoration.
- To assess the effectiveness of these bonding systems in preventing marginal leakage.
- To analyze the interface between the bonding agent, amalgam, and tooth structure using confocal laser scanning microscopy (CLSM).
Main Methods:
- Class V cavities in human teeth were prepared and lined with four different bonding systems.
- Restorations were completed using Logic amalgam.
- Teeth underwent thermocycling in basic fuchsin dye, followed by sectioning and evaluation of dye penetration using CLSM.
Main Results:
- No bonding system completely eliminated microleakage.
- Significant differences in microleakage were observed between Amalgambond Plus with HPA and the other three systems (Prime & Bond 2.1, Fuji Plus, Optibond Solo) on both enamel and dentine.
- Amalgambond Plus exhibited significantly more leakage on dentine, while Prime & Bond 2.1 showed more leakage on enamel. No significant differences were found among Prime & Bond 2.1, Fuji Plus, and Optibond Solo.
- CLSM revealed variations in hybrid layer thickness, resin penetration into dentinal tubules, and resin incorporation into amalgam particles.
Conclusions:
- Amalgambond Plus with HPA demonstrated inferior marginal sealing compared to Optibond Solo, Fuji Plus, and Prime & Bond 2.1.
- Optibond Solo, Fuji Plus, and Prime & Bond 2.1 are viable options for improving the marginal seal of amalgam restorations.
- Further research may explore long-term clinical performance and different cavity preparations.