Dimensional stability of a polyvinylsiloxane impression material following ethylene oxide and steam autoclave sterilization.
Polyvinlsiloxane impressions were made from a stainless steel master die machined to stimulate five full veneer crown preparations symmetrically placed in an arch form. Three groups of 10 impressions each were made. Treatment groups were sterilized using an ethylene oxide gas and a conventional steam autoclave. Casts were poured and intrapreparation, height, and diameter measurements were made using a stereomicroscope, a digital electronic caliper, and a 1-inch travel dial indicator. Analysis of dimensional changes for the two groups showed that casts made from impressions sterilized by ethylene oxide are acceptable for use in the construction of fixed or removable prostheses. Casts made from impressions sterilized in a steam autoclave can be used for the fabrication of diagnostic casts and some transitional prostheses, but not for routine construction of crowns or fixed partial dentures.
Holtan
J R
JR
Division of Fixed Prosthodontics, University of Minnesota, School of Dentistry, Minneapolis.
Olin
P S
PS
Rudney
J D
JD
D000704:Analysis of Variance; D003442:Crowns; D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique; D003801:Dental Veneers; D005027:Ethylene Oxide / Q000008:administration & dosage / Q000627:therapeutic use*; D005740:Gases; D003765:Models, Dental; D011145:Polyvinyls / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry*; D013227:Steam; D013242:Sterilization / Q000379:methods*; D013499:Surface Properties
D003760:Dental Impression Materials; D005740:Gases; D011145:Polyvinyls; D012833:Siloxanes; D013227:Steam; C034183:vinyl polysiloxane; D005027:Ethylene Oxide