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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/16284

Title: Influence on dimensional accuracy of volume of wash material introduced into pre-spaced putty/wash impressions
Authors: Omar, R.
Abdullah, M.
Sherfudhin, H.
Keywords: Dental impression materials; dental impression technique; dental models; denture; partial; fixed; reproducibility of results; silicone elastomers; statistics; nonparametric; vertical dimension
Issue Date: 2003
Publisher: FDI World Dental Press Ltd
Citation: Eur Journal Prosthodont Restor Dent; 11(4): 149-155
Abstract: This study compared the accuracy of stone models obtained from two-stage, pre-spaced putty/wash impressions under conditions in which known volumes of wash material were introduced during the second stage of the impression: Group I, a quantity of wash material corresponding to the space provided; Group II, double the quantity of wash material as the space provided; Group III, double the quantity of wash material, but with V-shaped vents in the putty for escape of excess material. Percentage deviations of the vertical dimensions of stone dies with respect to the master model were significantly different between Groups I and II (the latter being shorter) (p < 0.05). For horizontal dimensions, differences were less consistent, although the deviations for Groups I and II and Groups II and III, with respect to the master model, were significantly different from each other for two of the three dimensions measured (Group II inter-abutment distances were generally larger) (p < 0001 and p < 0.05, respectively). It is concluded that putty recoil, resulting from compression by excess wash material, plays a significant role in the undersizing of working dies, although the level of clinical relevance is less clear.
URI: http://hdl.handle.net/123456789/16284
ISSN: 0965-7452
Appears in Collections:College of Dentistry

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