Periodontitis is inflammatory disease that develops due to host response to microbial dental plaque. It can lead to loss of periodontal attachment and result in alveolar bone resorption and tooth loss (TL). The primary etiological agent in formation of periodontitis is microbial dental plaque; however, local/environmental factors also play role in development of this disease. 1,2 Correct classification of diseases and clinical conditions according to their severity, extent and prognosis is useful for clinical decision making and scientific research. Classifications for periodontal diseases have been made over the years according to scientific findings and needs. 3 According to 1999 periodontal disease classification, periodontitis was classified as chronic (CP), aggressive (AgP), necro-
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