Influence of polymerization procedure on marginal leakage of composite resin restorations – an in vitro study
Journal Title: Prosthodontics - Year 2018, Vol 68, Issue 3
Abstract
Introduction. Composite materials are currently most commonly used to reconstruct tooth tissues. During the polymerization, it results in marginal leakage between filling and hard dental tissues. Marginal leakage causes bacterial microleakage which leads to the discoloration of restoration margin and secondary caries. Intensive development of new technologies focus on elaborate processes decreasing the risk of microleakage appearance. Aim. The purpose of this in vitro study was to estimate marginal leakage degree in composite restorations which were polymerized with different kinds of lamps. Material and methods. 35 extracted human permanent molars were used in the study. Calibrated cavities on interproximal surfaces (class 2.2 acc. Mount and Hume classification) were prepared. Teeth were divided into 5 groups. Cavities were filled with composite materialaccording to the manufacturer’s instructionsusing different kinds of polymerizationlamps: halogen (floodlight) lamp, high intensity LED lamp and LED lamp with three working modes. Marginal leakage was evaluated by estimating a dye penetration and SEM images registration. Quantitative analysis of marginal gap was also performed. Results. In samples analysis with optical microscope and stereo microscope the dye penetration and marginal gap was not observed. Only scanning electron microscope with back-scatter detector has revealed the marginal leakage. the largest marginal leakage was observed in case of high intensity led lamp– FlashMax(1.60 μm), and the smallest for LED lamp – pulse and increasing modes(0.96 μm and 0.98 μm, respectively). Marginal leakage was not observed in samples polymerized with continuous mode of LED lamp. Conclusions. The results of this study suggest that the increase in light intensity of the polymerization lamp significantly shortens the exposure time, which is clinically advantageous, but excessive light intensity can cause severe systolic tensions leading to a marginal leakage.<br/><br/>
Authors and Affiliations
Anastazja Żuławnik, Małgorzata Zielonka, Karolina Obroniecka, Dariusz Zasada, Agnieszka Mielczarek
Keywords
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- EP ID EP363298
- DOI 10.5604/01.3001.0012.2558
- Views 96
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