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Time-dependent Antibacterial Effects of the Self-Adjusting File Used with Two Sodium Hypochlorite Concentrations.
MedLine Citation:
PMID:  21924201     Owner:  NLM     Status:  In-Data-Review    
INTRODUCTION: This in vitro study evaluated the time-dependent ability of the self-adjusting file (SAF) used with either of two NaOCl concentrations to reduce bacterial populations in long oval root canals.
METHODS: Oval-shaped canals from extracted teeth were infected with Enterococcus faecalis for 30 days and subjected to preparation with the SAF system using continuous irrigation with either 2.5% NaOCl (n = 11) or 6% NaOCl (n = 11). Bacteriological samples were taken before preparation (baseline) and after 2, 4, and 6 minutes of SAF operation.
RESULTS: Intragroup quantitative analyses revealed that the SAF operating for 2, 4, or 6 minutes yielded a highly significant bacterial reduction when compared with counts at baseline (P < .001) irrespective of the NaOCl concentration. No significant differences were found for intragroup analyses comparing the three time periods (P > .05). Likewise, intergroup quantitative analysis showed no significant difference for the SAF with 2.5% NaOCl or 6% NaOCl during 2, 4, or 6 minutes (P > .05). The incidence of positive cultures in the 2.5% NaOCl group was 6 of 11, 5 of 11, and 2 of 11 after 2, 4, and 6 minutes, respectively. Corresponding figures in the 6% NaOCl group were 4 of 11, 2 of 11, and 1 of 11. When all samples were gathered together, overall findings revealed that using the SAF for 6 minutes significantly reduced both the bacterial counts (P = .02) and the incidence of positive cultures (P = .04) when compared with 2 minutes.
CONCLUSIONS: Findings revealed that the SAF promoted a significant reduction in bacterial populations even after only 2 minutes regardless of the NaOCl concentration. The most impressive results were obtained after a 6-minute operation.
Flávio R F Alves; Bernardo M Almeida; Mônica A S Neves; Isabela N Rôças; José F Siqueira
Publication Detail:
Type:  Journal Article     Date:  2011-07-27
Journal Detail:
Title:  Journal of endodontics     Volume:  37     ISSN:  1878-3554     ISO Abbreviation:  J Endod     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-09-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7511484     Medline TA:  J Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1451-5     Citation Subset:  D    
Copyright Information:
Copyright © 2011 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.
Department of Endodontics, Faculty of Dentistry, Estácio de Sá University, Rio de Janeiro, Rio de Janeiro, Brazil.
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