Document Type : Research Article
Islamic Azad University, Falavarjan Branch, Falavarjan, Iran
Al-Zahra University, Tehran, Iran
Isfahan University of medical science faculty of dentistery, Isfahan, Iran
Ghaem University, Tehran, Iran
Gingivitis is an inflammatory destructive disease mainly caused by microbial plaques. Gram-positive and gram-negative bacilli or cocci have been isolated from dental plaque and gingivitis. This study was going to isolate and characterize the pathogenic bacteria from gingival of 100 patients with oral gingivitis. Enriched and specific media used for isolation of bacteria. Identification of isolated bacteria performed via gram staining and biochemical tests. 361 strains comprising 55.98% Streptococci, 2.62% Staphylococcus aureus, 4.22% gram-negative cocci, 26.38% gram-positive bacilli, 0.03% gram-positive filamentous bacteria, 1.3% gram-negative bacilli, 1.3% yeasts, and 1.3% gram-negative filamentous bacteria were isolated. Streptococcus sanguis, Streptococcus mitis, and Streptococcus mutans were the most frequent species among isolated streptococci. The results of present study indicate that a wide range of pathogenic bacteria are responsible for destructions of gingival among Iranian patients. Because of the communication ability of these infections, the diagnosis and treatment of the patients is necessary according to the public health care systems.