title: Microbiological profile of untreated subjects with localized aggressive periodontitis.
abstract: OBJECTIVE
  The microbial profile of localized aggressive periodontitis (LAgP) has not yet been determined. Therefore, the aim of this study was to evaluate the subgingival microbial composition of LAgP.
  
  
  METHODS
  One hundred and twenty subjects with LAgP (n=15), generalized aggressive periodontitis (GAgP, n=25), chronic periodontitis (ChP, n=30) or periodontal health (PH, n=50) underwent clinical and microbiological assessment. Nine subgingival plaque samples were collected from each subject and analysed for their content of 38 bacterial species using checkerboard DNA-DNA hybridization.
  
  
  RESULTS
  Red complex and some orange complex species are the most numerous and prevalent periodontal pathogens in LAgP. The proportions of Aggregatibacter actinomycetemcomitans were elevated in shallow and intermediate pockets of LAgP subjects in comparison with those with GAgP or ChP, but not in deep sites. This species also showed a negative correlation with age and with the proportions of red complex pathogens. The host-compatible Actinomyces species were reduced in LAgP.
  
  
  CONCLUSIONS
  A. actinomycetemcomitans seems to be associated with the onset of LAgP, and Porphyromonas gingivalis, Tannerella forsythia, Treponema denticola, Campylobacter gracilis, Eubacterium nodatum and Prevotella intermedia play an important role in disease progression. Successful treatment of LAgP would involve a reduction in these pathogens and an increase in the Actinomyces species.
authors.affiliation: Department of Periodontology, Dental Research Division, Guarulhos University, Guarulhos, SP, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Faveri
authors.forename: Luciene Cristina
authors.initials: LC
authors.lastname: Figueiredo
authors.forename: Poliana Mendes
authors.initials: PM
authors.lastname: Duarte
authors.forename: Maria Josefa
authors.initials: MJ
authors.lastname: Mestnik
authors.forename: Marcia Pinto Alves
authors.initials: MP
authors.lastname: Mayer
authors.forename: Magda
authors.initials: M
authors.lastname: Feres
mesh_terms: D000190:Actinomyces / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D016976:Aggregatibacter actinomycetemcomitans / Q000502:physiology; D010520:Aggressive Periodontitis / Q000382:microbiology*; D000898:Antibiosis; D001421:Bacteria, Anaerobic / Q000502:physiology*; D016022:Case-Control Studies; D004269:DNA, Bacterial / Q000032:analysis; D003773:Dental Plaque / Q000382:microbiology*; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D009693:Nucleic Acid Hybridization; D055815:Young Adult
chemical_list: D004269:DNA, Bacterial