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Microleakage of Class II box-type composite restorations
N J Opdam1, J J Roeters, R C Burgersdijk
1Department of Cariology and Endodontology, University of Nijmegen, The Netherlands.
American Journal of Dentistry
|July 1, 1999
Summary
In Class II restorations, using glass ionomer cement or dentin primers did not reduce microleakage compared to a simple total-etch system. Some primer systems showed increased microleakage at both cervical and occlusal margins.
Area of Science:
- Restorative Dentistry
- Dental Materials Science
- Adhesive Dentistry
Background:
- Microleakage remains a significant challenge in Class II composite restorations, potentially leading to secondary caries and postoperative sensitivity.
- Optimizing adhesive systems and liner materials is crucial for improving the longevity and clinical success of dental restorations.
Purpose of the Study:
- To evaluate the microleakage of small box-type Class II composite restorations using glass ionomer cement, a dentin primer, or a self-etching primer compared to a simple total-etch system.
- To determine if advanced bonding agents offer superior marginal integrity over conventional methods in specific cavity preparations.
Main Methods:
- 84 extracted premolars underwent standardized Class II composite restorations with enamel margins.
- Teeth were restored using a phosphonated total-etch system (control), glass ionomer lining cement, a total-etch adhesive with primer, or a total-etch adhesive with a self-etching primer.
- Restorations were subjected to thermocycling, dye immersion, and sectioning to assess cervical and occlusal microleakage.
Main Results:
- No significant difference in microleakage prevention was observed between experimental groups and the control group (P < 0.05).
- Specific primer-containing systems (Scotchbond Multi-Purpose with maleic acid and Liner Bond 2) exhibited significantly higher cervical and occlusal microleakage compared to the control.
- The incorporation of a glass ionomer lining cement did not enhance the restoration's marginal seal.
Conclusions:
- In small box-type Class II preparations, advanced total-etch systems incorporating primers did not consistently outperform a simple phosphonated total-etch bonding agent in preventing microleakage.
- The use of glass ionomer lining cement provided no additional benefit in reducing microleakage for these specific restorations.
- Clinical selection of adhesive systems should consider cavity design and potential for increased microleakage with certain primer-based total-etch approaches.