Influence of a passive sonic irrigation system on the elimination of bacteria from root canal systems: a clinical study

J Endod. 2010 Aug;36(8):1315-8. doi: 10.1016/j.joen.2010.04.024.


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.

Publication types

  • Comparative Study
  • Randomized Controlled Trial

MeSH terms

  • Bacteria / drug effects*
  • Calcium Hydroxide / therapeutic use
  • Colony Count, Microbial
  • Dental Pulp Cavity / microbiology*
  • Dental Restoration, Temporary
  • Disinfection / methods
  • Humans
  • Periapical Periodontitis / microbiology
  • Periapical Periodontitis / therapy
  • Root Canal Filling Materials / therapeutic use
  • Root Canal Irrigants / administration & dosage*
  • Root Canal Preparation / instrumentation
  • Root Canal Preparation / methods*
  • Sodium Hypochlorite / administration & dosage
  • Sonication / instrumentation
  • Syringes
  • Therapeutic Irrigation / instrumentation
  • Time Factors
  • Ultrasonics


  • Root Canal Filling Materials
  • Root Canal Irrigants
  • Sodium Hypochlorite
  • Calcium Hydroxide