[Basic knowledge: prosthetics, impressions and impression materials (III)].
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The custom tray is recommended for impressions in which it is desirable to establish precise borders, such as Kennedy class I maxillary partial dentures, where an accurate postpalatal seal is a requirement. The peripheries, including the postpalatal seal, can be established with a high degree of accuracy with a custom tray. A procedure is described that does not require a primary impression or a primary cast to make a custom tray for elastomeric impression materials.
Starting from the chemical and physical processes which occur during the cross-linking of silicones, the author represents the material and processing properties of these impression compounds. He reports above all of the results of utilizationoriented studies which evidence the effects of different conditions of processing on the behaviour during impression taking and on the impression itself. Conclusions are drawn as to the appropriate use of silicone impression materials.
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