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Liner and light exposure: effect on in-vitro Class V microleakage
Nádia da Rocha Svizero1, Paulo Henrique Perlatti D'Alpino, Mário Honorato Júnior da Silva e Souza
1Department of Operative Dentistry, Universidade do Sagrado Coração, Bauru, SP, Brazil.
Operative Dentistry
|July 1, 2005
Summary
Glass ionomer liners reduce microleakage in resin composite restorations. However, high-intensity light curing significantly increased dye penetration, indicating a potential risk for dental fillings.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Microleakage is a significant concern in resin composite restorations, potentially leading to secondary caries and pulpitis.
- Glass ionomer cements are used as liners to improve marginal seal and reduce microleakage.
- Curing methods can influence the physical properties and clinical performance of dental restorations.
Purpose of the Study:
- To evaluate the effect of different glass ionomer liners and light-curing methods on the microleakage of resin composite restorations.
- To compare the efficacy of conventional glass ionomer cement (Ketac Bond) and resin-modified glass ionomer cement (Vitrebond) as liners.
- To assess the impact of various light-curing strategies on marginal integrity.
Main Methods:
- An in vitro study using 120 bovine incisors with Class V preparations.
- Liner application: no liner (control), Vitrebond, or Ketac Bond.
- Resin composite (Single Bond + Z100) placement and polymerization.
- Four light-curing methods were employed.
- Thermocycling followed by immersion in basic fuchsin dye for microleakage assessment.
Main Results:
- No significant difference in microleakage was observed between conventional, ramp, or pulse-delay curing methods.
- High-intensity light curing resulted in significantly greater dye penetration compared to other methods.
- No significant difference in marginal leakage between the two types of glass ionomer liners was found.
- Restorations without liners exhibited significantly higher microleakage.
- No interaction was observed between lining technique and light-curing method.
Conclusions:
- Glass ionomer liners effectively reduce microleakage in resin composite restorations.
- High-intensity light curing should be used with caution as it may increase microleakage.
- The choice of liner material did not significantly impact marginal seal in this study.
- Optimizing light-curing parameters is crucial for ensuring the longevity of dental restorations.