title: Comparison of disinfectants by immersion and spray atomization techniques on the linear dimensional stability of different interocclusal recording materials: An in vitro study.
abstract: OBJECTIVE
  To evaluate and compare the effect of 0.5% chlorhexidine gluconate, 1% sodium hypochlorite, and 2% glutaraldehyde by immersion and spray atomization technique on the linear dimensional stability of Jet bite, Aluwax and Ramitec interocclusal recording materials.
  
  
  METHODS
  Three representative materials: Jet bite (addition silicone), Aluwax and Ramitec (polyether) were mixed according to manufacturer's instructions and then specimens were prepared according to the specifications of ISO 4823. All the specimens except the control (distilled water) were treated with disinfectant solutions (0.5% chlorhexidine gluconate, 1% sodium hypochlorite, and 2% glutaraldehyde) for 30 and 60 min (n = 10) by spray and immersion technique. Once removed from the solutions, the test samples were washed in water for 15 s, dried and measured after 24 h 3 times using a measuring microscope with an accuracy of 0.0001 mm. Two-way ANOVA and Tukey's test with significance level of 5% were used to assess the statistical data (α = 0.05).
  
  
  RESULTS
  All groups showed no significant difference statistically, in linear dimension when disinfected for 30 min by spray or immersion technique. Polyether had significantly higher dimensional variation when immersed in sodium hypochlorite for 60 min. Addition silicone showed the least dimensional change which ranged from 0.024% to 0.05%, followed by polyether from 0.004% to 0.171% and Aluwax from 0.146% to 0.228%.
  
  
  CONCLUSIONS
  To preserve the dimensions and surface of the recording materials and effective microbial elimination, restrictions should be applied in the method of disinfection and time duration. However, using the disinfectants either by spray or immersion technique, the dimensional change was <0.5% which was not clinically significant according to the American Dental Association specification no. 19 criteria within the first 24 h.
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Saveetha Dental College and Hospital, Saveetha University, Chennai, Tamil Nadu, India.
authors.forename: Revathy
authors.initials: R
authors.lastname: Gounder
authors.affiliation: Department of Prosthodontics, Ex-Professor of Army College of Dental Sciences, Dr. NTR University of Health Sciences, Vijayawada, Andhra Pradesh, India.
authors.forename: B V J
authors.initials: BVJ
authors.lastname: Vikas
keywords: Addition silicone; Aluwax; bite registration materials; dimensional stability; disinfection; interocclusal recording materials; polyether