Microleakage Assesment of Class V Composite Restorations Rebonded with Three Different MethodsMicroleakage Assesment of Class V Composite Restorations Rebonded with Three Different Methods

Abstract

Background: When composite resin polymerizes, shrinkage stresses tend to produce gaps at the tooth restoration interfaces. The aim of this study was to assess the ability of two low viscosity resin systems (Single Bond, and Prompt L-Pop) and a specific surface penetrating (PermaSeal) sealant in preventing microleakage in class V composite restorations.

Methods: Hundred and five caries free human premolars were selected. Wedge shaped cavities with occlusal margins in enamel and cervical margins in dentin were prepared and restored using Single Bond and Z100 composite resin. After storing the samples in distilled water for 24 hours, finishing and polishing was done and then they were randomly divided into six groups each including 15 samples along with one control group. Other groups were sealed using three different agents with and without etched margins. The specimens were thermocycled and then, immersed in a 50% silver nitrate solution as tracer agent for 4 hours. All samples sectioned longitudinally and analyzed for leakage (dye penetration) using a stereomicroscope. Kruskal-Wallis and Mann Whitney U tests were used for statistical analysis. 

Results: Kruskal-Wallis test showed significant differences between the groups. Mann-Whitney U analysis revealed significant reduction in microleakage only in two groups namely, PermaSeal with etched and Prompt L-Pop without etched margins. There was no evidence of microleakage at the occlusal margins in any group.

Conclusion: The results obtained in this in vitro study showed that applying PermaSeal with etched and Prompt L-Pop without etched margins could reduce marginal leakage and improve marginal integrity.

Keywords: Composite resins, dental bonding, leakage.