Sonic irrigant activation for root canal disinfection: power modes matter!

Eggmann, Florin; Vokac, Yvonne; Eick, Sigrun; Neuhaus, Klaus W (2020). Sonic irrigant activation for root canal disinfection: power modes matter! BMC Oral Health, 20(1), p. 102. BioMed Central 10.1186/s12903-020-01088-5

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Sonic irrigant activation has gained widespread popularity among general dentists and endodontists alike in recent years. This in vitro study aimed to evaluate the impact of three power modes of a sonic activation device (EDDY) on its antimicrobial effectiveness in infected root canals.


The root canals of straight, human roots (n = 120) were prepared to size 40/.06. In a short-term infection experiment, the root canals were inoculated with different microbial species for three days. The following irrigation protocols, using 4 ml of normal saline as irrigant, were performed: negative control, manual rinsing, sonic irrigant activation at power modes "low", "medium" and "high". In a second, long-term experiment, testing the same irrigation protocols, inoculation lasted 21 days and sodium hypochlorite was used as irrigant. Sequential infection control samples were assessed using culture assays. The statistical analysis included one-way analysis of variance of log10-scaled counts of colony-forming units (CFU) with post-hoc comparisons using Bonferroni corrections and Chi2 tests (α = 0.05).


In the short-term experiment, the sonic irrigation protocols decreased the number of CFUs by 1.88 log10 units compared with the negative control (p < 0.001). The power modes "medium" and "high" achieved the most effective reduction of the microbial load. In the long-term experiment, microbial regrowth occurred after 7 days unless the device was used at its highest power setting.


The power modes of the sonic irrigation device have a significant impact on the effectiveness for endodontic disinfection. The sonic irrigation device should always be used at the highest power setting in order to maximize its antimicrobial effectiveness.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > School of Dental Medicine > Department of Periodontology
04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry
04 Faculty of Medicine > School of Dental Medicine > Periodontics Research

UniBE Contributor:

Eick, Sigrun, Neuhaus, Klaus


600 Technology > 610 Medicine & health




BioMed Central




Daniela Zesiger

Date Deposited:

23 Dec 2020 10:12

Last Modified:

05 Dec 2022 15:42

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

Endodontic disinfection Needle irrigation Oral bacteria Sodium hypochlorite Sonic activation




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