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To create the material, the user simply mixes a colored putty (often blue or pink) with a white putty, and the chemical reaction begins. PVS with a wide variety of working and setting times is available commercially. [3] Final set is noted when the product rebounds upon touching with a blunt or sharp instrument.
An impression body, made from alginate impression material. A custom dental model or plaster cast . A dental impression is a negative imprint of hard and soft tissues in the mouth from which a positive reproduction, such as a cast or model, can be formed.
Impression materials are designed to be liquid or semi-solid when first mixed, then set hard in a few minutes, leaving imprints of oral structures. Common dental impression materials include sodium alginate, polyether and silicones. Historically, plaster of Paris, zinc oxide eugenol and agar were used.
Alginate impression of the upper dental arch. Alginate is an elastic irreversible hydrocolloid and one of the most common impression materials. It has a mixing time of 45–60 seconds and is fast setting. [19] Advantages of alginate are it has good surface detail, it is elastic so it works well with undercuts, it has a low wetting angle and it ...
Alginate is used as an ingredient in various pharmaceutical preparations, such as Gaviscon, in which it combines with bicarbonate to inhibit gastroesophageal reflux. [citation needed] Sodium alginate is used as an impression-making material in dentistry, prosthetics, lifecasting, and for creating positives for small-scale casting. [citation needed]
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