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Volume 20 , Issue 6
November/December 2007

Pages 573–575

Dimensional Accuracy of 2-Stage Putty-Wash Impressions: Influence of Impression Trays and Viscosity

Markus Balkenhol, Dr Med Dent/Paul Ferger, Prof Dr Med Dent/Bernd Wöstmann, Prof Dr Med Dent

PMID: 18069363

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. Int J Prosthodont 2007;20:573–575.

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