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1. The purpose of this study is to determine the antibacterial effect of the remedies commonly used in operative dentistry. 2. Experiment were performed against staphylococcus albus which were isolated from different root canals. 3. Isolated bacteria were inoculated on nutrient agar and disk which has been saturated antiseptics were placed on it, then this plate was incubated for 48 hours at 37℃. 4. Inhibition zone were measured around antiseptic disks. 5. The results of 45 cases of experiments showed as follows. Average diameter of inhibition zone around phenol disk was 2.99 mm, camphorated phenol, 0.74 mm, formocresol, 13.46mm, formocresol (Korea), 12.7 mm, eugenol, 4.74mm, thymol, 16.46 mm.
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