title: [A study on bacterial contamination of dental handpieces].
abstract: OBJECTIVE
  The aim of this study is to evaluate the effects of different factors, including concentration of the bacterial suspension, number of stops set on handpieces, and different disinfectants, on bacterial contamination of handpieces and their clinical significance.
  
  
  METHODS
  Bacterial contamination of 20 handpieces were analyzed in different concentration of bacterial suspension, number of stops set on handpieces and after using different out surface disinfectants.
  
  
  RESULTS
  Statistical increment (P < 0.05) of handpieces inside contamination was observed relevant to increment of the bacterial suspension concentration. No statistical relevance was seen between handpiece inside contamination and the number of stops set on handpieces(P > 0.05). Disinfection with different disinfectants significantly decreased out surface contamination(P < 0.05), but no statistical change of bacteria (P > 0.05) was observed inside handpieces.
  
  
  CONCLUSIONS
  As the concentration of bacterial suspension is the key factor affecting the inside contamination of handpieces, oral cavity cleanness is essential before dental therapy. The surface disinfection of handpieces is necessary after dental therapy, but cannot prevent cross-contamination between patients.
authors.affiliation: College of Stomatology, West China University of Medical Sciences.
authors.forename: T
authors.initials: T
authors.lastname: Hu
authors.forename: X
authors.initials: X
authors.lastname: Meng
authors.forename: Y
authors.initials: Y
authors.lastname: Zuo
authors.forename: X
authors.initials: X
authors.lastname: zhou
mesh_terms: D003428:Cross Infection / Q000517:prevention & control; D003754:Dental High-Speed Equipment / Q000382:microbiology*; D004202:Disinfectants; D004203:Disinfection / Q000379:methods; D004866:Equipment Contamination / Q000517:prevention & control*; D006801:Humans; D066298:In Vitro Techniques
chemical_list: D004202:Disinfectants