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Background and purpose: Natural disinfecting agents for home disinfection of removable orthodontic appliances can be a good alternative for chemical solutions.Purpose of this study is to compare the efficacy of Zatariamultiflora essential oil, 0.12% chlorhexidine and sterile tap water (control) in removing Candida and Streptococcus viridans colonies from the acrylic baseplates of removable orthodontic appliances. Materials and methods: 20 participants were enrolled in the study. Each participant wore a removable orthodontic appliance for 7 consecutive nights. After the period of use, the baseplates were cut into 3 equal in size samples. Two of the samples were randomly sprayed with one of the test solutions: Zatariamultiflora essential oil and 0.12% chlorhexidine. After 10 minutes the disinfected specimens were rinsed with tap water. One of the samples was only rinsed with tap water (control group). With microbial culture technique, the colony counts of Candida and Streptococcus viridans microorganisms were counted for each group. Friedman test and Wilcoxon Signed Ranked Test were used for statistical analysis. Results: There were statistically significant differences among the groups (p< .05) for both Candida and S.viridans. Two-by-two comparisons showed that all test solutions differed significantly. Chlorhexidine was significantly more effective in reducing colonies than Zatariamultiflora essential oil, and both test solutions were better than control group. Conclusion: Zatariamultiflora essential oil with the concentration and time used in this study cannot be a good alternative for 0.12% chlorhexidine.

Keywords: Chlorhexidine, Zatariamultiflora, Candida, Streptococcus viridans, Removable orthodontic baseplate

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