title: Effect of immersion disinfection on properties of impression materials.
abstract: OBJECTIVE
  Dimensional change and wettability were determined for three addition silicones and a polyether impression material after disinfection by immersion for two 30-minute cycles in 2% acid-potentiated glutaraldehyde.
  
  
  METHODS
  Contact angles of water on disks were measured on a goniometer. Dimensional change was determined by change in distance between two reference lines. Contact angle (degree) and dimensional change (percent) of five samples were measured after 0-, 30-, 60-, and 1,440-minute intervals of storage in air and disinfectant.
  
  
  RESULTS
  The contact angle in air increased for two addition silicones and remained constant for the remaining materials. In disinfectant, the contact angle increased for all four materials, with the contact angle of the polyether increasing the least. In air, dimensional change decreased significantly for an addition silicone and a polyether. In disinfectant, the dimensional changes of the addition silicones were not significant, but the polyether increased in dimension after 1,440 minutes.
  
  
  CONCLUSIONS
  Two 30-minute cycles of disinfection in 2% acid-potentiated glutaraldehyde reduced wettability, but had little effect on the dimensional change of the addition silicones and polyethers tested.
authors.affiliation: Department of Oral Biomaterials, University of Texas, Houston Health Science Center, Dental Branch.
authors.forename: B A
authors.initials: BA
authors.lastname: Davis
authors.forename: J M
authors.initials: JM
authors.lastname: Powers
mesh_terms: D000704:Analysis of Variance; D003760:Dental Impression Materials / Q000737:chemistry*; D004203:Disinfection; D004987:Ethers / Q000737:chemistry; D005976:Glutaral / Q000737:chemistry*; D007101:Immersion; D008422:Materials Testing; D012826:Silicone Elastomers / Q000737:chemistry; D013997:Time Factors; D017155:Wettability
chemical_list: D003760:Dental Impression Materials; D004987:Ethers; D012826:Silicone Elastomers; D005976:Glutaral