الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
This study was conducted to test the effectiveness of three locally available natural flavonoid-containing products (Egyptian propolis, Egyptian Olea europaea and Egyptian Morus nigra) as alternatives for sodium hypochlorite in endodontic irrigation regarding their antimicrobial activity, their effect on root dentin micro-hardness and their effect on the push-out bond strength between dentin and resin-based sealers. Ethanolic extracts of the three natural materials were prepared using the 2cold simple maceration3 technique. Chemical analysis of the three natural products was performed to determine their total flavonoid content, their total phenols content and their antioxidant properties. The results revealed that propolis had the highest flavonoid and phenol content compared to the other groups while olea europaea had the highest antioxidant activities. A total of 72 teeth were collected for this study based on the sample size calculation data. The collected samples were randomly grouped into four groups according to the type of the irrigant applied: group 1; 2.5% NaOCl (control), group 2; 2% ethanolic extract of propolis, group 3; 8% ethanolic extract of olea europaea and group 4; 2% ethanolic extract of morus nigra. The antimicrobial activity of the test groups was measured against a standardized strain of Enterococcus faecalis suspension (ATCC 29212) using agar dilution method. Results revealed that the three natural products possessed statistically significant higher antimicrobial activities compared to group 1 but statistically non significant compared to each other