title: Prevalence of Bacteroides forsythus, Porphyromonas gingivalis and Actinobacillus actinomycetemcomitans in subgingival microflora of Japanese patients with adult and rapidly progressive periodontitis.
abstract: OBJECTIVE
  This study investigated the prevalence of Bacteroides forsythus, Porphyromonas gingivalis and Actinobacillus actinomycetemcomitans among various periodontitis patients and healthy individuals in Japan, and correlated it with clinical parameters.
  
  
  METHODS
  Subgingival plaque samples were collected from 21 patients with adult periodontitis (AP), 8 with rapidly progressive periodontitis (RPP) and 15 healthy individuals.
  
  
  RESULTS
  The frequency detected in culture was as follows: B. forsythus was found in 47.6% of AP sites and in 37.5% of RPP sites. P. gingivalis was identified in 64.3% of AP and 59.4% of RPP sites. A. actinomycetemcomitans was detected in 4.8% of AP and 3.1% of RPP sites. The 3 species were detected in only 2 of the healthy individuals. The proportion of B. forsythus in the total microflora in culture was 0.07% in the healthy group, 4.1% in AP and 2.4% in RPP. The proportions of P. gingivalis were 0% in the healthy group, 18.8% in AP and 16.2% in RPP. The proportion of A. actinomycetemcomitans was very low in all 3 groups. A DNA probe detected B. forsythus in 78.6% of AP and 65.6% of RPP sites, as well as P.gingivalis in 58.3% of AP and 59.4% of RPP sites. A. actinomycetemcomitans was detected in only 1.2% of AP sites. The 3 species were undetectable in the healthy group.
  
  
  CONCLUSIONS
  The prevalence and the proportion of B. forsythus and P. gingivalis were significantly correlated with clinical parameters, suggesting that B. forsythus and P. gingivalis are closely related to AP and RPP in the Japanese population.
authors.affiliation: Periodontology, Department of Hard Tissue Engineering, Graduate School, Tokyo Medical and Dental University, Japan. kazuko-yano.peri@dent.tmd.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Yano-Higuchi
authors.forename: N
authors.initials: N
authors.lastname: Takamatsu
authors.forename: T
authors.initials: T
authors.lastname: He
authors.forename: M
authors.initials: M
authors.lastname: Umeda
authors.forename: I
authors.initials: I
authors.lastname: Ishikawa
mesh_terms: D016976:Aggregatibacter actinomycetemcomitans / Q000302:isolation & purification / Q000472:pathogenicity*; D010520:Aggressive Periodontitis / Q000382:microbiology; D016301:Alveolar Bone Loss / Q000382:microbiology; D000704:Analysis of Variance; D015373:Bacterial Typing Techniques; D001439:Bacteroides / Q000302:isolation & purification / Q000472:pathogenicity*; D016009:Chi-Square Distribution; D015169:Colony Count, Microbial; D015342:DNA Probes; D004269:DNA, Bacterial / Q000032:analysis; D003773:Dental Plaque / Q000382:microbiology; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010512:Periodontal Index; D010518:Periodontitis / Q000382:microbiology*; D016966:Porphyromonas gingivalis / Q000302:isolation & purification / Q000472:pathogenicity*; D018709:Statistics, Nonparametric
chemical_list: D015342:DNA Probes; D004269:DNA, Bacterial