The Evaluation of Anti-Microbial-Effect to Enterococcus Faecalis by Hypochlorous Acid Water

Abstract

Periapical periodontitis is a major disease, and difficult to achieve successful treatment in some cases. Therefore, root canal irrigation is one of the most important processes to successful endodontic treatment. Sodium Hypochlorite (NaOCl) solution is the most commonly used root canal irrigate. However using NaOCl solution on endodontic treatment should be considered its problems such as allergy, serious tissue damage when inadvertently injected into the maxillary sinus or oral mucosa. Therefore, another root canal irrigant that is safe and has a high antimicrobial effect is desirable. In this study, Hypochlorous Acid (HClO) water was used to evaluate the microbicidal efficacy of the Enterococcus faecalis (E. faecalis) and considered the possibility to be a future root canal irrigant candidate. Original (200ppm), 10% diluted (20ppm), 25% diluted (50ppm) and 50% diluted (100ppm) HClO water were used in this study. Each experimental solution was mixed with low concentrations (5×107 CFU/ml) or high concentration (5×109 CFU/ml) of E. faecalis at 30 seconds, 1minute, 3 minutes, 5 minutes respectively. Then they were placed onto BHI agar plates and incubated for 48 h at 37 ºC, followed by counting the number of Colony formation. The results showed that in the condition of 5×107 CFU/ml E.faecalis, no colony formation was shown within 30 seconds by 50 % diluted HClO water. Whereas only original water was attained to inhibit colony formation completely within 30 seconds under the density of 5×109 CFU/ml E, faecalis. In conclusion, 200ppm HClO water has a capacity to anti-microbiological effect against E.faecalis same as NaOCl solution. Keywords: root canal irrigant, hypochlorous acid (HClO) water, Enterococcus faecalis (E. faecalis)