Impressions for Dentures

May 19th, 2015
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University of Victoria
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Mucoperiosteum cannot be compressed; however, it can be displaced in the absence of confining walls.Purpose is to have as broad an area evenly distributing stress to minimize trauma to the tissues.

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Before the middle of the 18th century no method for producing an impression of the alveolar ridges. Ridges were painted with dye and a block of ivory or bone was pressed on the ridge. Areas of contact were scraped away.1756 beeswax was the first material used in making impressions.1840 Charles de Loude first references to impression trays.1847 Desirabode referred to an impression tray.1842 Montgomery discovered gutta percha.1848 Gutta percha introduced as an impression material, high working temp and stiffness made it difficult to achieve satisfactory results.1844 Plaster of Paris first used as an impression material.1862 Franklin first corrected impression, wax followed by a plaster wash.Until the early1900s, wax or plaster were used directly.1857 Modeling plastics developed by Charles Stens1874 Modeling plastics developed by S. S. White1900 Green brothers introduce a method for manipulating the modeling plastics. First to use the term "posterior dam" in describing the posterior palatal seal.S.G Supplee introduced the hot water heater for modeling plastics.1915 Rupert Hall perfected the first moderate-heat modeling plastic for making individual impression trays. Used black modeling plastic for making a custom tray in which impression plaster was placed for the correction.1925 Poller agar for dental impressions. Not ideal for edentulous impressions.Late 1920s first functional impression waxes developed. Waxes used before this time were paraffin and

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