Colak Gulben*


Objective: This study's objective was to evaluate the flexural strength of the five restorative materials. Materials and Methods: The specimens were prepared from five materials: a high viscosity GIC (Fujı IX GP; GC, Tokyo, Japan), a resin-modified GIC (Fujı II LC; GC, Tokyo, Japan), a nano-filled resin composite (Estelite Σ Quick; Tokuyama, Tokyo, Japan) and a micro-hybrid resin composite (Charisma Smart; Heraeus Kulzer, Hanau, Germany), a giomer (Beautifil II; Shofu, Kyoto, Japan). A teflon mold was used to create the fifteen bar-shaped specimens from each material (n=15). To produce a flat surface, the specimens were gently polished by hand using 1,000- and 1,500-grit wet silicon carbide papers in a circular motion. Each specimen received a quick rinse with tap water in between each grit. All the samples were made at room temperature (21± 1 °C), with a relative humidity of 55 percent. Each group spent 24 hours before testing in distilled water at 37°C. The flexural strength was evaluated according to ISO standards on a universal testing machine. The Kolmogorov-Smirnov test was used to determine if the data were normally distributed. One-way ANOVA and Tukey HSD posthoc tests were used to compare the mean flexural strength values across the groups (P = 0.05). Results: The high viscosity GIC had the lowest flexural strength value (p<0.05). The giomer, nano-filled resin composite, and micro-hybrid resin composite had the highest flexural strength values (p<0.05). There were no statistically significant differences between the flexural strength values of the giomer, nano-filled resin composite, and micro-hybrid resin composite (p>0.05). Statistically, the flexural strength of the resin-modified glass ionomer was higher than that of the high viscosity glass ionomer (p<0.05). However, compared to giomer, the nano-filled resin composite, and the micro-hybrid resin composite, the flexural strength value of the resin-modified glass ionomer was statistically lower (p<0.05). Conclusion: While the addition of resin to glass ionomer cement improves the flexural strength of the material, there is no difference between the flexural strength values of resin composites and giomer.

Keywords: High viscosity glass ionomer cement, Resin-modified glass ionomer cement, Giomer, Flexural strength.

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