Strength properties of light-cured dental restorative composites

The compressive strength of dental restorative composites was studied in this research. Cylindrical specimens were made according to manufacturers' recommendations and stored for two weeks in distilled water at 37degC. Compressive strength was measured using a mechanical test machine with a cross-head speed of 0.5 mm/min; then, acquired data were analyzed using ANOVA and Weibull statistics. Among the studied composites, Filtek
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Z350 exhibited the highest compressive fracture strength which could be due to its filler fraction and proper combination of aggregated zirconia/silica cluster fillers in a uniform nanostructure.