Marginal Leakage of Silorane, Ormocer, and Dimethacrylate-based Composites

Objectives: To assess and compare in vitro the marginal leakage of silorane, ormocer, and dimethacrylate-based composites in class V restorations. Methods: A total number of 50 non-carious human premolars or molars after debridement were collected in 0.5% chloramine solvent for 7 days and then stored in distilled water at room temperature. Then the standard Class V cavities were prepared in which the occlusal margin of each restoration was on enamel and the gingival margin on dentin. Teeth were randomly assigned to five groups (n=10) and restored with 5 types of resin-based restorative materials consisting of; hybrid (Spectrum TPH, Dentsply), micro-hybrid (Tetric Ceram, Ivoclar-Vivadent), nano-hybrid (Tetric EvoCeram, Ivoclar-Vivadent), ormocer (Ceram X, Dentsply) and silorane-based (Filtek Silorane, 3M ESPE) composites. The specimens were stored in distilled water at 37 °C for 7 days, and then subjected to thermocycling. All teeth were then placed in a silver nitrate solution and vertically cut in a bucco-lingually direction. Subsequently, the specimens were evaluated for microleakage using a stereomicroscope. Data were analyzed using a non-parametric Kruskal-Wallis test at a P<0.05 level of significance. Results: The degree of microleakage at the gingival margins for the Filtek Silorane (silorane-based composite) followed by Tetric Ceram (micro-hybrid) and Tetric EvoCeram (nano-hybrid) was significantly lower than that of Ceram X (ormocer) and Spectrum TPH (hybrid) composite materials (P<0.05). No statistically significant difference in the microleakage at the occlusal margins was observed among the resin-based restorative materials tested (P>0.05). Conclusions: From the results, it was concluded that the silorane-based composite material could provide an effective marginal seal comparable with that of micro or nano-hybrid composites.