| Time-dependent Antibacterial Effects of the Self-Adjusting File Used with Two Sodium Hypochlorite Concentrations. | |
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MedLine Citation:
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PMID: 21924201 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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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. |
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Authors:
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Flávio R F Alves; Bernardo M Almeida; Mônica A S Neves; Isabela N Rôças; José F Siqueira |
Publication Detail:
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Type: Journal Article Date: 2011-07-27 |
Journal Detail:
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Title: Journal of endodontics Volume: 37 ISSN: 1878-3554 ISO Abbreviation: J Endod Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-09-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7511484 Medline TA: J Endod Country: United States |
Other Details:
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Languages: eng Pagination: 1451-5 Citation Subset: D |
Copyright Information:
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Copyright © 2011 American Association of Endodontists. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Endodontics, Faculty of Dentistry, Estácio de Sá University, Rio de Janeiro, Rio de Janeiro, Brazil. |
Export Citation:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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