One of the special kinds of periodontal disease is rapidly progressive periodontitis (RPP). This form of periodontitis is an aggressive disease, which results in bone destruction and loss of periodontal attachment 4 to 5 times more than adult periodontitis or slowly progressive periodontitis. The purpose of this study was to investigate the presence of Actinobacilius actinomyct-em comitans (Aa) in RPP patients. A total number of sixty samples was collected from 15 patients with RPP and cultured inanaerobic conditions. Results showed the presence of Aa in 13 patients (86.7%), while 29 samples were Aa positive (48.3%). Two of the RPP patients (13.3%) were Aa negative even after two times bacterial culturing.
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