title: Relationship between volatile sulphide compounds concentration and oral bacteria species detection in the elderly.
abstract: OBJECTIVE
  To evaluate the relationship between oral bacteria species detection and volatile sulphide compounds (VSC) concentration in the elderly.
  
  
  METHODS
  Cross-sectional microbiological and clinical VSC examination of elderly.
  
  
  METHODS
  Sixty-seven elderly people aged 75, who were functionally independent and dentate.
  
  
  METHODS
  VSC (H2S and CH3SH) concentrations in the mouth air of subjects were measured using portable gas chromatography. Oral bacteria samples were taken from dental plaque and identification of bacteria species was accomplished using standard methods.
  
  
  RESULTS
  Fewer than 20% of subjects showed more than 10 ng/10 ml of H2S (severe odour level). The detection rate of P. melaninogenica was significantly higher in elderly people with more than 10 ng/10 ml (p=0.043) levels. Fusobacterium had a tendency to be found in those with more than 10 ng/10 ml, but a significant relation was not found.
  
  
  CONCLUSIONS
  The results suggest that Fusobacterium and P. melaninogenica may be involved in the production of H2S in the oral cavity of elderly people.
authors.affiliation: Laboratory Head, Department of Bacteriology, National Institute of Infectious Diseases, 1-23-1, Toyama, Shinjuku-ku, Tokyo 162-8640, Japan. hsenpuku@nih.go.jp
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Senpuku
authors.forename: Akio
authors.initials: A
authors.lastname: Tada
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yamaga
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Hanada
authors.forename: Hideo
authors.initials: H
authors.lastname: Miyazaki
mesh_terms: D000368:Aged; D001419:Bacteria / Q000145:classification*; D002175:Candida / Q000302:isolation & purification; D002206:Capnocytophaga / Q000302:isolation & purification; D003430:Cross-Sectional Studies; D003773:Dental Plaque / Q000382:microbiology; D005260:Female; D005673:Fusobacterium / Q000302:isolation & purification; D006209:Halitosis / Q000378:metabolism / Q000382:microbiology; D006801:Humans; D006862:Hydrogen Sulfide / Q000032:analysis; D008297:Male; D009055:Mouth / Q000378:metabolism / Q000382:microbiology*; D001443:Prevotella melaninogenica / Q000302:isolation & purification; D013211:Staphylococcus aureus / Q000302:isolation & purification; D013438:Sulfhydryl Compounds / Q000032:analysis; D013457:Sulfur Compounds / Q000032:analysis*
chemical_list: D013438:Sulfhydryl Compounds; D013457:Sulfur Compounds; D006862:Hydrogen Sulfide