Prosthetic Treatment of the Edentulous Patient by R. M. Basker & J.C. Davenport & J.M. Thomason

Author:R. M. Basker & J.C. Davenport & J.M. Thomason
Language: eng
Format: epub
ISBN: 9781444393255
Publisher: Wiley
Published: 2011-02-03T16:00:00+00:00

10

Impressions

This chapter describes the clinical techniques necessary for obtaining accurate preliminary and master impressions. The information presented here is directly related to the theoretical discussion on stability in Chapter 4.

A denture is constructed on a cast of the denture-bearing tissues. Before this cast can be made, an impression, or negative likeness, of these tissues is obtained. The impression material, which is held against the tissues and supported by an impression tray, exhibits plastic flow in the initial stages and then subsequently hardens or sets. Either plaster of Paris or model stone is then poured into the impression to form the cast, or positive likeness, of the denture-bearing tissues.

If maximum accuracy of the casts is to be achieved, a two-stage impression procedure is required. First, preliminary impressions are taken using stock ‘off the peg’ impression trays and second, the more accurate master impressions are taken using trays which have been ‘tailor-made’ for a particular patient on casts obtained from the preliminary impressions.

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