Abstract
Introduction The present investigation evaluated the ability of a new passive sonic irrigation (sonic group) system (EndoActivator) to eliminate cultivable bacteria from root canals in vivo and compared it with that of standard syringe irrigation (control group). Methods Data were obtained by using bacteriologic sampling of root canals treated by endodontic residents. Sampling results from 1 session of treatment were then compared with results obtained after intervisit calcium hydroxide disinfection and a second session of treatment. Results There was no significant difference in the ability of sonic group and control group to eliminate cultivable bacteria from root canals ( P > .05). A second session and intervisit calcium hydroxide disinfection were able to eliminate cultivable bacteria from significantly more teeth than a single session of treatment ( P < .05). Conclusions These in vivo results strengthen the case for a multi-visit approach to the treatment of apical periodontitis.
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