title: Dimensional accuracy of 2-stage putty-wash impressions: influence of impression trays and viscosity.
abstract: The aim of this in vitro study was to evaluate the influence of the impression tray and viscosity of the wash material on the dimensional accuracy of impressions taken using a 2-stage putty-wash technique. Identically shaped metal stock trays (MeTs) and disposable plastic stock trays (DiTs) were used for taking impressions (n = 10) of a mandibular cast (4 abutments) with 2 different impression materials. Dies were poured and the relative diameter deviation was calculated after measurement. Zero viscosity of the materials was determined. Dimensional accuracy was significantly affected when DiTs were used. Lower-viscosity wash materials led to more precise impressions.
authors: Department of Prosthodontics, School of Dental Medicine, Justus-Liebig-University, Schlangenzahl 14, 35392 Giessen, Germany. markus.balkenhol@dentist.med.uni-giessen.de
authors: Markus
authors: M
authors: Balkenhol
authors: Paul
authors: P
authors: Ferger
authors: Bernd
authors: B
authors: Wöstmann
mesh_terms: D003760:Dental Impression Materials; D003761:Dental Impression Technique / Q000295:instrumentation*; D004209:Disposable Equipment; D006244:Hardness; D008422:Materials Testing; D008670:Metals; D003765:Models, Dental; D011145:Polyvinyls; D012833:Siloxanes; D018709:Statistics, Nonparametric; D014783:Viscosity
chemical_list: D003760:Dental Impression Materials; D008670:Metals; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane