title: A survey of disinfection of irreversible hydrocolloid and silicone impressions in European Union dental schools: epidemiologic study.
abstract: OBJECTIVE
  The objective of this cross-sectional study was to describe corresponding procedures for irreversible hydrocolloid and silicone impressions taught and used in European Union dental schools.
  
  
  METHODS
  A self-administered questionnaire requesting information about rinsing and disinfection methods was sent to each of the 373 heads of prosthodontic, pedodontic, and orthodontic departments in the 131 European Union dental schools. Response rate was 94%. Statistical analysis included chi-square or Fisher exact tests, and ANOVA or Kruskall-Wallis tests.
  
  
  RESULTS
  Of the responding departments, 92% systematically rinsed their impressions. Fifteen percent of the departments, mostly orthodontics, never disinfected irreversible hydrocolloid impressions, and 11% never disinfected silicone impressions. The immersion method was used by 65% for irreversible hydrocolloid impressions (73% for silicone), with a disinfection time of 10.3 +/- 6.3 minutes (11.8 +/- 7.4 for silicone). The disinfected impressions were not rinsed by 16% for irreversible hydrocolloid and 14% for silicone. Most departments used brand-name products.
  
  
  CONCLUSIONS
  The same disinfection procedure for both irreversible hydrocolloid and silicone impressions was used by 78% of departments. There was great diversity, however, between departments in the procedure used for each impression material.
authors.affiliation: Department of Dental Public Health, Faculty of Dentistry, University of Nice Sophia Antipolis, France. muller@unice.fr
authors.forename: Michèle
authors.initials: M
authors.lastname: Muller-Bolla
authors.forename: Laurence
authors.initials: L
authors.lastname: Lupi-Pégurier
authors.forename: Ana Myriam
authors.initials: AM
authors.lastname: Velly
authors.forename: Marc
authors.initials: M
authors.lastname: Bolla
mesh_terms: D000464:Alginates; D000704:Analysis of Variance; D016009:Chi-Square Distribution; D003430:Cross-Sectional Studies; D019551:Dental Disinfectants; D003760:Dental Impression Materials; D004203:Disinfection / Q000379:methods; D005060:Europe; D005062:European Union; D019552:Infection Control, Dental / Q000379:methods*; D012575:Schools, Dental; D012828:Silicones; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires
chemical_list: D000464:Alginates; D019551:Dental Disinfectants; D003760:Dental Impression Materials; D012828:Silicones