title: Effect of 0.12% chlorhexidine in reducing microorganisms found in aerosol used for dental prophylaxis of patients submitted to fixed orthodontic treatment.
abstract: OBJECTIVE
  This study aimed at assessing, in vivo, whether the prior use of 0.12% chlorhexidine as mouthwash would decrease air contamination caused by aerosolized sodium bicarbonate during dental prophylaxis. The study was conducted with 23 patients aged between 10 and 40 years old who were randomly selected and undergoing fixed orthodontic treatment.
  
  
  METHODS
  The study was divided into two phases (T1 and T2) with a 30-day interval in between. In both phases, dental prophylaxis was performed with aerosolized sodium bicarbonate jetted to the upper and lower arches for 4 minutes. In T1, 10 minutes before the prophylaxis procedure, the participants used distilled water as mouthwash for one minute; whereas in T2, mouthwash was performed with 0.12% chlorhexidine. Microbial samples were collected in BHI agar plates for microbiological analysis. Two dishes were positioned on the clinician (10 cm from the mouth) and a third one at 15 cm from the patient's mouth. The samples were incubated for 48 hours at 37°C. Results were expressed in colony-forming units (CFU).
  
  
  RESULTS
  Statistical analysis carried out by means of Student's t test, as well as Wilcoxon and Kruskal-Wallis tests revealed that the prior use of 0.12% chlorhexidine as mouthwash significantly reduced CFU in the three positions studied (P < 0.001).
  
  
  CONCLUSIONS
  The prior use of 0.12% chlorhexidine as mouthwash significantly reduced contamination caused by aerosolized sodium bicarbonate during dental prophylaxis in the orthodontic clinic.
authors.forename: Isis Rodrigues Menezes dos
authors.initials: IR
authors.lastname: Santos
authors.forename: Ana Cristina Azevedo
authors.initials: AC
authors.lastname: Moreira
authors.forename: Myrela Galvão Cardoso
authors.initials: MG
authors.lastname: Costa
authors.forename: Marcelo de
authors.initials: Md
authors.lastname: Castellucci e Barbosa
mesh_terms: D000293:Adolescent; D000328:Adult; D000336:Aerosols; D000391:Air Microbiology; D016902:Air Pollution, Indoor / Q000517:prevention & control*; D000891:Anti-Infective Agents, Local / Q000627:therapeutic use*; D001419:Bacteria / Q000302:isolation & purification; D058491:Bacterial Load; D002648:Child; D002710:Chlorhexidine / Q000627:therapeutic use*; D003777:Dental Prophylaxis / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D009067:Mouthwashes / Q000627:therapeutic use*; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective; D017693:Sodium Bicarbonate / Q000008:administration & dosage / Q000627:therapeutic use*; D055815:Young Adult
chemical_list: D000336:Aerosols; D000891:Anti-Infective Agents, Local; D009067:Mouthwashes; D017693:Sodium Bicarbonate; D002710:Chlorhexidine
keywords: Aerosol propellant; Chlorhexidine; Effects of air contamination