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Year : 2021  |  Volume : 33  |  Issue : 2  |  Page : 97-101

Comparative antimicrobial efficacy of oregano oil, chlorhexidine, and sodium hypochlorite against Enterococcus faecalis: An in vitro study

1 Department of Conservative Dentistry and Endodontics, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India
2 Department of Conservative Dentistry and Endodontics, Private Consultant, Anna University, Chennai, Tamil Nadu, India
3 Department of prosthodontics and implantology, Sibar Institute of Dental Science, Guntur, Andhra Pradesh, India
4 Department of Food Processing Technology, Anna University, Chennai, Tamil Nadu, India

Correspondence Address:
Dr. Krishnamachari Janani
MDS, Conservative Dentistry and Endodontics, Chennai, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/endo.endo_124_20

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Objective: The purpose of this study was to evaluate the comparative antibacterial efficacy of 0.2% oregano oil, 2% chlorhexidine (CHX), and 3% sodium hypochlorite (NaOCl) in disinfection of dentin tubules contaminated with Enterococcus faecalis. Materials and Method: One hundred and twenty human extracted anterior teeth were infected with E. faecalis for 21 days. They were assigned into three groups (n = 40) – Group 1: 3% NaOCl, Group 2: 2% CHX, and Group 3: 0.2% oregano oil. Disinfection protocol was followed using 31-gauge side-vented needle. After chemomechanical preparation, the apical 5 mm of the roots was removed frozen in liquid nitrogen and pulverized to expose E. faecalis in dentinal tubules. The number of colony-forming units of E. faecalis per mg dentin was determined. The data were analyzed statistically. Results: Zone of inhibition of oregano oil was found to be 15 mm, and the values were significant in Group III (P < 0.05) as compared to the other groups assessed. Conclusion: Within the study's limitation, 0.2% oregano oil showed better disinfection property against E. faecalis among tested irrigants. Therefore, it can be used as an effective alternative root canal irrigant.

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