title: Surface Detail Reproduction and Effect of Disinfectant and Long-Term Storage on the Dimensional Stability of a Novel Vinyl Polyether Silicone Impression Material.
abstract: OBJECTIVE
  This study investigated the surface detail reproduction and dimensional stability of a vinyl polyether silicone (VPES) in comparison to a vinylpolysiloxane (VPS) material as a function of prolonged storage for up to 2 weeks.
  
  
  METHODS
  Heavy-body VPES (EXA'lence(TM) Fast Set) and VPS (Imprint(TM) 3 Quick Step) were compared. Forty impression ingots of each material were made using a stainless steel die as described by ANSI/ADA specification No. 19. Twenty impressions of each material were disinfected by immersion in a 2.5% buffered glutaraldehyde solution. Surface quality was assessed and scored immediately after making the ingots. Dimensional stability measurements were made immediately and repeated on the same ingots after 7 and 14 days storage in ambient laboratory conditions. Data were analyzed using the D'Agostino and Pearson omnibus normality test followed by two-way repeated measures ANOVA with post hoc Bonferroni tests. Values of p < 0.01 were deemed to be significant.
  
  
  RESULTS
  Disinfected VPES and VPS specimens had significantly reduced dimensional changes at 7 and 14 days when compared with the nondisinfected ones (p < 0.0001). The dimensional stability of both materials was within ANSI/ADA specification No. 19's acceptable limit throughout the 2-week test period, regardless of whether they were disinfected. Out of the initial 80 ingots, 8 VPES and 1 VPS ingot scored a 2 on the surface detail test, while the remaining 71 ingots scored 1.
  
  
  CONCLUSIONS
  Heavy-body fast-set VPES experienced minimal contraction in vitro after prolonged storage, though surface detail scores were not as consistent as those of the VPS tested. The least contraction occurred when the material was examined immediately after ingot production.
authors.affiliation: School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Usama
authors.initials: U
authors.lastname: Nassar
authors.affiliation: School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Ava K
authors.initials: AK
authors.lastname: Chow
mesh_terms: D019551:Dental Disinfectants / Q000494:pharmacology; D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique; D017267:Dental Prosthesis Design; D005976:Glutaral / Q000494:pharmacology; D006801:Humans; D011145:Polyvinyls / Q000737:chemistry*; D012828:Silicones / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry*; D013499:Surface Properties / Q000187:drug effects; D013501:Surface-Active Agents / Q000737:chemistry*; D013997:Time Factors
chemical_list: D019551:Dental Disinfectants; D003760:Dental Impression Materials; C000613953:EXA'lence Fast Set; D011145:Polyvinyls; D012828:Silicones; D012833:Siloxanes; D013501:Surface-Active Agents; C034183:vinyl polysiloxane; D005976:Glutaral
keywords: VPES; Vinyl polyether silicone; dimensional stability; impression material; surface detail