Evaluation of microleakage of giomer and silorane based resins - in vitro study

Abstract

Introduction: Despite of the significant improvement, methacrylate-based composites still exhibit polymerization stress forces, which could lead to damages in adhesion to tooth structures and microleakege, postoperative sensitivity and secondary caries. The aim of this study was to compare the microleakage at the interface between cavity walls and giomer and silorane-based composite material restorations. Material and methods: Eighteen extracted human teeth were used in this study. Two types of cavities were prepared on each tooth. The teeth were randomly assigned in two groups, each one with 9 teeth (18 cavities). The first group was restored with the giomer Beautiful II and the second one with Filtec Silorane. The samples were subjected to 400 thermo cycles. The teeth were immersed in a 2% methylene blue buffered solution for 24 hours and rinsed under running tap water for 24 hours. They were hemi-sectioned longitudinally bucco-lingually through the center of the restoration and mycroleakage analysis was done. Results: None of the tested materials was without any microleakage. The average microleakage scores for the giomer were 0.72±0.83 (type I cavities - 1.00±0.87; type II cavities - 0.44±0.73) and for the silorane - 0.33±0.69 (type I cavities - 0.56±0.88; type II cavities - 0.11±0.3.3). Conclusion: Based on the data obtained from the present study it can be concluded that silorane-based composite revealed less microleakage compared to the giomer. The cavities with smaller sizes revealed less microleakage as was expected in our null hypothesis.