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:: Volume 28, Issue 4 (Winter 2011) ::
J Dent Sch GYEAR__, 28(4): 214-218 Back to browse issues page
The effectiveness of Hero (taper 4% & 6%) instrumentation techniques on the elimination of Enterococcus faecalis from root canal
Ali Kangarloo Dr., Mahsa Eskandari Nejad Corresponding Author: Dr. *, Zohre Ahangari Dr.
Postgraduate Student
Abstract:   (8066 Views)

Background and Aim: Due to the deeper penetration of bacteria like Enterococcus faecalis into dentinal tubules in pulp diseases, different tapering in root canal therapies leads in different dentinal removal from root canal wall. Then, root canals with higher tapering will contain lower microbial microbial contents. Furthermore, together with higher prevalence of root fractures in teeth with more tapering, the aim of this study is comparing the effect of different tapering of Hero Rotary files (6% versus 4%) in reduction of Enterococcus faecalis bacteria from the root canal of human extracted teeth.

Materials & Methods: Seventy human extracted teeth were divided in two equal experimental (Hero 4%as group 1and Hero 6% as group 2) (n=27) and the control group (n=6).Two extra control group (positive n=5 and negative n=5) took for confirmation the canal reinfection, too. All of the samples prepared by K file No 20 and Gates Gilden No 2 & 3 before sterilization. Then the teeth were autoclaved and were infected with Enterococcus faecalis. The experimental groups were instrumented either with Hero 4% or with Hero 6% files up to #30. Bacteriological samples were taken after instrumentation to determine the level of remaining bacteria.

Results: In the group 1 two samples and in the group 2 six samples represented complete reduction of bacteria. There was not statistically significant different between the two groups.

Conclusion: Aggressive preparation with an instrumentation technique removing substantial amounts of dentin (Hero 6%) did not reduce the intracanal bacteria more effectively than a more conservative instrumentation technique (Hero 4%) (P>0.05).

J Dent Sch 2011 28(4): 214-218

Keywords: Enterococcus faecalis bacteria, Rotary endodontic files, Root canal preparation
Full-Text [PDF 259 kb]   (1465 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2010/12/20
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Kangarloo A, Eskandari Nejad M, Ahangari Z. The effectiveness of Hero (taper 4% & 6%) instrumentation techniques on the elimination of Enterococcus faecalis from root canal. J Dent Sch. 2011; 28 (4) :214-218
URL: http://jds.sbmu.ac.ir/article-1-847-en.html
Volume 28, Issue 4 (Winter 2011) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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