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Year : 2017  |  Volume : 7  |  Issue : 2  |  Page : 86-92

Comparative evaluation of efficacy of conventional and passive ultrasonic irrigation with sodium hypochlorite against three endodontic pathogens: An in vitro study

Department of Conservative Dentistry and Endodontics, Bapuji Dental College and Hospital, Davangere, Karnataka, India

Correspondence Address:
Dr. J Arun
Room No 6, Department of Conservative Dentistry and Endodontics, Bapuji Dental College and Hospital, Davangere - 577 004, Karnataka
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijohs.ijohs_68_16

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Introduction: The main goal of endodontic therapy is the complete removal of the pulpal tissues and bacteria within the pulp space to provide an adequate space for three dimensional root canal filling, resulting in a positive environment for the regeneration of periapical tissues. Infections of endodontic origin are treated mainly by means of mechanical procedures aided by chemical substances, of which sodium hypochlorite (NaOCl) is the most commonly used. Different irrigation regimens have been proposed to enhance the effectiveness of NaOCl in disinfecting the root canal system, the use of ultrasonics being one among them. Based on these premises, the purpose of the study is to compare the efficacy of two different irrigation methods in reducing the bacterial count within the root canal. Objective of the Study: The aim of this study is to compare the efficacy of syringe-needle irrigation to passive ultrasonic agitation in reducing the bacterial count of three endodontic pathogens within the root canal. Methodology: The study was conducted on 50 extracted human teeth. Teeth were decoronated and the apices were sealed with autopolymerizing resin. The teeth were then inoculated and incubated with a suspension comprising equal amount of three endodontic pathogens: Streptococcus mutans, Candida albicans, and Enterococcus faecalis (E. faecalis). The canal preparations were done using crown down technique and samples were divided into two groups based on irrigation technique: Group 1; Syringe-needle irrigation and Group 2; Additional ultrasonic agitation of irrigant (2.5% NaOCl). The root canals were sampled after the procedure and the samples were inoculated on the respective selective growth media and the colony-forming units (CFUs) were calculated. The statistical analysis used was Student's unpaired t-test for intergroup comparison and one-way ANOVA and Tukey's post hoc test for intragroup comparison. Results: The Group 2 (ultrasonic agitation) showed highly statistically significant lower CFUs when compared to Group 1 (syringe-needle irrigation). E. faecalis proved to be the most resistant microorganisms of the three used in the study. Conclusion: Within the limits of the study, ultrasonic agitation of an irrigant proves to be a promising option to achieve significant bacterial reduction and thus achieves reliable and predictable endodontic success.

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