title: Treponema socranskii, Treponema denticola, and Porphyromonas gingivalis are associated with severity of periodontal tissue destruction.
abstract: BACKGROUND
  The aim of the present study was to identify Treponema socranskii in addition to Treponema denticola and Porphyromonas gingivalis by polymerase chain reaction (PCR), and to clarify the relationship between the presence of these microorganisms and the severity of clinical periodontal parameters.
  
  
  METHODS
  Saliva and subgingival plaque collected from 123 subjects (38 aggressive periodontitis patients, 65 chronic periodontitis patients, 20 healthy patients) were subjected to PCR to detect the aforementioned 3 microorganisms.
  
  
  RESULTS
  Detection frequencies of T. socranskii, T. denticola, and P. gingivalis in plaque samples from aggressive periodontitis patients (71.1%, 73.7%, 84.2%, respectively) and chronic periodontitis patients (89.2%, 93.8%, 95.3%) were much higher than those from healthy subjects (30%, 5.0%, 10.0%). In aggressive and chronic periodontitis patients, these 3 species of bacteria were detected frequently at sites that showed deep periodontal pockets and severe attachment loss. The percentage of these bacteria-positive sites increased as the gingival index score of chronic periodontitis patients increased. T. socranskii was frequently detected together with T. denticola or P. gingivalis at the same sites, and coexistence of these microorganisms was frequently observed in deep periodontal pockets of aggressive periodontitis patients.
  
  
  CONCLUSIONS
  T. socranskii, T. denticola, and P. gingivalis were frequently detected in periodontitis patients by PCR. The prevalence of these 3 microorganisms was correlated with various clinical parameters. Taken together, our findings suggest that T. socranskii, T. denticola, and P. gingivalis are associated with the severity of periodontal tissue destruction.
authors.affiliation: Division of Periodontology, Department of Hard Tissue Engineering, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. takeuchi.peri@tmd.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Takeuchi
authors.forename: M
authors.initials: M
authors.lastname: Umeda
authors.forename: M
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Benno
authors.forename: Y
authors.initials: Y
authors.lastname: Huang
authors.forename: I
authors.initials: I
authors.lastname: Ishikawa
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016866:Bacteroidaceae Infections; D002908:Chronic Disease; D016001:Confidence Intervals; D004269:DNA, Bacterial / Q000032:analysis; D003773:Dental Plaque / Q000382:microbiology; D003774:Dental Plaque Index; D005884:Gingival Hemorrhage / Q000382:microbiology; D006801:Humans; D016015:Logistic Models; D008875:Middle Aged; D016017:Odds Ratio; D017622:Periodontal Attachment Loss / Q000382:microbiology; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000382:microbiology; D010518:Periodontitis / Q000145:classification / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D016966:Porphyromonas gingivalis / Q000502:physiology*; D012463:Saliva / Q000382:microbiology; D014208:Treponema / Q000145:classification* / Q000502:physiology; D014211:Treponemal Infections
chemical_list: D004269:DNA, Bacterial