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Background and Aims: The purpose of this study was to evaluate the mechanical properties of flowable dental composites containing the antibacterial compound. Materials and Methods: The study was conducted through experimental design. Compound 3(2,5Dimethylfuran-3-yl) -1H-pyrazol-5(4H)-one were synthesized using Ethyl chloroformate, hydrazine hydrate and 3-acetyl-2,5-dimethylfuran. In this study we had six experimental groups consisting of five resin composites containing 3(2,5dimethylfuran -3-yl) -1H-pyrazole-5 (4H) -one in different concentrations of 1, 2, 3, 4, and 5 wt.% and one control group with no additive. They were prepared by high speed mixer at room temperature and under normal conditions for humidity and temperature, using standard 4049 compressive strength tests. Their diametral tensile and flextural strength were evaluated. Results: With increasing percentage of antibacterial compound The flexural strength decreased but this difference was not significant between the 1% and control groups.(p>0.05) The results of diametral tensile strength showed that there was no significant difference between the control group and 1% but the compressive strength significantly decrease by increasing the percentage of compound 3(2,5dimethylfuran -3-yl) -1H-pyrazole-5 (4H) -one.(p<0.05) Conclusion: The combination of antibacterial component, although leads to an acceptable increase in the antibacterial properties of flowable dental composites and in Their flextural and tensile strengths had no effect, but a significant decrease in their compressive strengths, which could limit their use.

Evaluation of Mechanical Properties of Flowable Dental Composites Containing Antibacterial Compound