The present study aimed to isolate and identify the microorganisms associated with causing problems to patient in all period of wearing fixed orthodontic appliance ( FOA) in Ramadi city. Sixty-six patients treated with FOA for a period ranged from 14 -35 years included in this study wabs were collected from gingival area around fixed orthodontic appliance to be cultured aerobically. Many important pathogens were isolated and identified in all age groups and in all duration include candida albicans, E.coli, Klebsiella spp., Staphylococci and many α.Hemolytic and β.Hemolytic Streptococci. The study recommended the use of antibiotic and antifungal drugs during wearing appliance in addition to the maintenance of a good oral hygiene. Further study is also recommended to cover the role of anaerobic bacteria.
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