Journal of the Korean Academy of Pediatric Dentistry 2009;36(1):1-11.
Published online February 28, 2009.
ANTIMICROBIAL EFFECT OF ESSENTIAL OILS ON ORAL BACTERIA
Sun-Young Lee, Jae-Gon Kim, Byeong-Ju Baik, Yeon-Mi Yang, Kyung-Yeol Lee, Yong-Hoon Lee, Mi-A Kim
Department of Pediatric Dentistry and Institute of Oral Bioscience, School of Dentistry, Chonbuk National University 
Correspondence:  Jae-Gon Kim,  Tel: 063-250-2128, Email: pedodent@chonbuk.ac.kr
Received: 4 July 2008   • Accepted: 3 November 2008
Abstract
Essential oils are mixture of volatile, lipophilic compounds originating from plants. Essential oils have potential biological effects, i.e., antibacterial, antifungal, spasmolytic and antiplasmodial activities and insect-repellent property. In this study, five essential oils, namely R, LG, FR, O, and NM, extracted from various aromatic plants were used to test their antimicrobial activity against the oral microorganisms. The effects of essential oils were investigated against eight important bacteria, Streptococcus mutans (S. mutans), Staphylococcus aureus (S. aureus), Streptococcus sanguis (S. sanguis), Streptococcus anginosus (S. anginosus), Actinobacillus actinomycetemcomitans (A. actinomycetemcomitans), Streptococcus sobrinus (S. sobrinus), Staphylococcus epidermidis (S. epidermidis), and Escherichia coli (E. coli). Essential oils, except NM, effectively inhibited the growth of tested oral pathogenic microorganisms dose-dependently. However, the essential oils didn't show a significant inhibitory effect against E. coli and S. epidermidis. Consequently, these results represented that essential oil-mediated anti-microbial activity was prominent against the oral pathogenic bacteria. For example, minimum bactericidal concentration(MBC) of R, LG, FR oil against A. actinomycetemcomitans was very low as 0.078 mg/mL. In addition, minimum inhibitory concentration (MIC) of R, LG, FR, O oil against S. mutans was low as 0.156 mg/mL in vitro.
Key Words: Essential oil, Minimal Inhibitory Concentration(MIC), Minimal Bactericidal Concentration(MBC)


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