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ABSTRACT
Orthodontic appliances often provide good retention sites for oral microorganisms. This leads to a high cariogenic challenge in saliva. The purpose of this study was to evaluate saliva Streptococcus Mutans and Lactobacilli levels in different 5 phase on 24 patients need to both removable and fixed orthodontic application. So we had a possibility to determinate of the S. Mutans and Lactobacilli level in the same sample. These counts were evaluated at 5 stages: before orthodontic treatment, 4 weeks after using of removable appliances, at least 2 weeks after bonding of the brackets, 1 week after application of mouth varnish, and at the end of the orthodontic treatment. Wilcoxon signed ranks test were used to statistical determination. This study shows that orthodontic removable appliances treatment doesn't affect the lactobacilli levels significantly (P>0.05) whereas the level of the S.mutans increased significantly (P<0.05). Besides of that the level of the lactobacilli and S. Mutans didn't change significantly during fixed orthodontic treatment in this oral hygen condition as we advised (P>0.05). In addition, we found that when patients use mouth varnish during fixed orthodontic treatment these microorganism levels reduced significantly (P<0.05).