Effect of fiber reinforcement on microleakage of class II II cavities restored with a novel G‐?nial posterior composite, silorane composite, and nanohybrid composite: an in vitro in vitro comparative study

摘要

Abstract Aim The aim of the present study was to compare G‐?nial, silorane, and nanoceramic composites and the effect of polyethylene fiber inserts in reducing gingival microleakage in class II composite restorations placed apical to the cementoenamel junction. Methods Standardized class II cavities were prepared on extracted molars and randomly divided into six groups ( n = 20 each): group 1, Ceram X mono; group 2, Ceram X mono + Ribbond; group 3, Filtek P90; group 4, Filtek P90 + Ribbond; group 5, G‐?nial posterior; and group 6, G‐?nial posterior + Ribbond. All specimens were subjected to a thermocycling regime, immersed in 2% methylene blue dye for 24 h, sectioned longitudinally, and examined under a stereomicroscope to assess dye penetration on a six‐point scale. The score data were subjected to statistical analysis, whereby the Kruskal–Wallis analysis of variance was used for multiple group comparisons and the Mann–Whitney test for groupwise comparisons at a significance level of P ≤ 0.05. Results A statistically‐significant decrease in microleakage was found when Ribbond fiber was used: group 2 vs group 1 ( P 0.001), group 4 vs group 3 ( P 0.001), and group 6 vs group 5 ( P 0.001). A significant decrease in microleakage scores was found in the silorane and G‐?nial posterior composites when compared to the nanoceramic composite ( P 0.001). Conclusion The use of polyethylene fiber, silorane composite, and G‐?nial posterior composite reduces microleakage in class II composite restorations with gingival margins below the cementoenamel junction.