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Dentin protection by a primer-less adhesive technique.
Morakot Piemjai1, Onusa Waleepitackdej, Franklin García-Godoy
1Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, Patumwon, Bangkok 10330, Thailand. tmorakot@chula.ac.th
American Journal of Dentistry
|December 15, 2011
Summary
Primer-less wet bonding with 1-1 adhesive for 10-60 seconds prevented microleakage in dental restorations. Contemporary wet bonding systems showed leakage at dentin margins, indicating potential for demineralized dentin issues.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials
Background:
- Demineralized dentin poses a challenge in dental restorations, potentially leading to microleakage.
- Primer-less wet bonding techniques aim to simplify the bonding procedure while maintaining bond integrity.
- Understanding dentin permeability is crucial for preventing secondary caries and restoration failure.
Purpose of the Study:
- To evaluate microleakage in demineralized dentin using primer-less wet bonding with varying total etching times (10-60 seconds).
- To compare the efficacy of primer-less wet bonding against contemporary resin adhesives in preventing leakage.
- To identify the optimal etching duration for primer-less wet bonding to ensure a sealed interface.
Main Methods:
- Human molars underwent Class V cavity preparation at the cementoenamel junction (CEJ).
- Seven bonding groups were tested: 1-1 primer-less wet bonding (10, 30, 60s etch), All-Bond 2 and Single-Bond 2 (wet bonding), AQ-Bond (self-etched), and Super-Bond C&B (dry).
- Dye penetration testing using basic fuchsin solution was performed after 24-hour water storage at 37°C to measure leakage.
Main Results:
- No microleakage was observed at enamel or dentin margins for the 1-1 primer-less groups, Super-Bond C&B, and AQ-Bond.
- Leakage at dentin margins occurred with All-Bond 2 (1.31 ± 1.39 mm) and Single-Bond 2 (0.37 ± 0.28 mm), necessitating phosphoric acid etching.
- Primer-less wet bonding demonstrated comparable or superior sealing ability compared to some contemporary wet bonding systems.
Conclusions:
- Primer-less wet bonding with 1-1 adhesive is effective in preventing microleakage across enamel and dentin margins, even with extended etching times.
- Contemporary wet bonding systems may exhibit leakage at dentin margins, highlighting the importance of proper smear layer management.
- Primer-less wet bonding presents a viable alternative for achieving durable and sealed dental restorations.
