Abstract
Objectives: The aim of this study was to evaluate the effectiveness of different concentrations of Chlorhexidine (CHX) and sodium hypochlorite (NaOCl) in disinfecting contaminated Resilon cones within one minute. Study design: Fifty Resilon cones were divided into seven experimental groups and three control groups of 5 cones each. The cones of experimental groups were contaminated with Entrococcus faecalis and subsequently disinfected with different concentrations of NaOCl or CHX. The cones were then transferred into glass tubes containing thioglycollate media and incubated for 7 days. The tubes were examined for turbidity every 24 hours, and if bacterial growth occurred, samples were plated, incubated, gram stained and observed under microscope to confirm E.faecalis growth. Negative, positive, and washing control groups were also used. Results: All the positive and washing control showed profound E.faecalis growth. All the cones disinfected with CHX showed bacterial growth; however, no E.faecalis growth occurred in any samples disinfected with NaOCl. Conclusion: Sodium hypochlorite, at concentrations of 0.5 to 5.25%, is an effective agent for disinfection of contaminated Resilon cones within one minute; however, chlorhexidine is unable to disinfect Resilon cones during one-minute exposure. Key words: Chlorhexidine, sodium hypochlorite, resilon, entrococcus faecalis.
Highlights
Microorganisms are the main etiologic factor of pulp and periapical pathosis [1]
Gutta-percha and Resilon cones are produced under aseptic conditions; they can be contaminated by aerosols and physical sources during storage [4,5,6]
The present study was designed to evaluate the effectiveness of different concentrations of NaOCl and CHX in rapid disinfection of contaminated Resilon cones
Summary
The primary goal of endodontic treatment is the elimination of microorganisms from infected root canals and prevention of their re-entry. For this purpose, every phase of endodontic therapy should be performed under aseptic conditions. Sodium hypochlorite (NaOCl), as the most common irrigating solution, has been used in several studies to disinfect contaminated gutta-percha or Resilon cones [7,8,9,10,11,12]. Gomes and Royal et al showed that 2% CHX is an effective agent in eliminating Entrococcus faecalis even within 15 seconds [5,7] All these studies have used 2% CHX, and there is no published study on the efficacy of the different concentrations of CHX. The present study was designed to evaluate the effectiveness of different concentrations of NaOCl and CHX in rapid disinfection of contaminated Resilon cones
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