Background: Orthodontic therapy using fixed or removable appliances has been found to be associated with plaque formation or caries incidence. Oral hygiene instructions and 3-6 month visits as well as assessment of the sulcus depth, tooth mobility, gingival recession, bone surface examinations and root planning by the dental hygienist are recommended for these purposes. Hence; we undertook the present study to assess different periodontal parameters following orthodontic treatment in aggressive periodontitis patients.  Materials & methods: The present study included assessment of 10 aggressive periodontitis patients who under fixed orthodontic treatment.. All patients presented the probing depth of ≥5 mm, infra-bony defects, 1 mm or more extrusion compared to the similar tooth in the dental arch, while they were all cooperative with the follow-up examinations. Periodontal index (PI), probing pocket depth (PPD) and peirdontal parameters were examined at the end of treatment and three as well as 6 months afterward. All the results were complied and recorded and analyzed by SPSS software. Results: At the time of finishing of the orthodontic treatment, after three months of finishing of orthodontic treatment and after six months of finishing if orthodontic treatment, the mean value of PI was found to be 26.254, 18.512 and 10.365 respectively. Significant difference was obtained while comparing the mean PI, PPD and PID at different time intervals respectively. Conclusion: By maintaining follow-up examination and good oral hygiene in patients undergoing orthodontic treatment, stable results can be obtained.
Key words: Periodontal, Orthodontic, Treatment.