Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 27 3-4 1998 09 15 63 72 M.H. Satan P. OuIia M. Khoshreza Z. Kadkhoda 2015 10 03 The bacterial population found in the gingival sulcus region in periodontitis consists of gram negative microorganisms; most of them are obligate anaerobes and capnophil, including Porphyromonas, Prevotella, Fusobaclenuin, Welinella, Actinobacillus actinomycetem comitans, Eiknella and Capnocytohaga. This study has been carried out to investigate anaerobic and capnophilic bacteria from 206 specimens of patients with periodontitis and 145 specimens of control group. Different bacteria isolated from total specimens were obtained as follows: Actinobacillus actinomycetem comitans (patients group 36.9%, control group 4.1 %), Capnocytophaga (47.9%), Eikenella corodens (34.5% , 10.3%), Porphyryromonas gingivaIis (35% , 11%), Prevotella intermedius25.7%, 6.7%) and Prevotella melaninogenicus (13.6% , 3.4%). https://ijph.tums.ac.ir/index.php/ijph/article/view/1758 https://ijph.tums.ac.ir/index.php/ijph/article/download/1758/1739