Background As a resistant bacterium species in infected root canals, Enterococcus faecalis needs to be removed in any endodontic treatment. So, we aimed to compare the effectiveness of two rotary systems, Gentlefile and Pro Taper Universal, in removing Enterococcus faecalis ( E. faecalis ) from the infected root canal system. Material and Methods Forty single-root premolar teeth were collected and randomly divided into two groups: Gentlefile (n=18) and Pro Taper Universal (n=18). In addition, four teeth were used as a negative control. The root canals were prepared and infected with E. faecalis and incubated for 4 weeks. Samples were obtained from the root canal immediately before and after instrumentation. A reduction in bacteria was determined by the colony count method. Results Colony numbers of E. faecalis were significantly different before and after instrumentation in all groups ( p <0.001). Furthermore, Gentlefile group illustrated a higher percentage of bacterial reduction (96.1%) compared to Pro Taper Universal group (90%). Accordingly, Gentlefile group was found to be significantly ( p <0.001) more effective in decreasing bacterial populations than Pro Taper Universal group. Conclusions Although both rotary systems were highly effective in bacterial reduction from root canals, Gentlefile demonstrated better bacterial reduction percentage from root canals than Pro Taper Universal. Key words: Enterococcus faecalis, Gentlefile, Pro Taper Universal, Rotary systems.
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