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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. It is made by placing an appropriate material in a dental impression tray which is designed ...
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.
Zinc oxide eugenol is also used as an impression material during construction of complete dentures and is used in the mucostatic technique of taking impressions, usually in a special tray, (acrylic) produced after primary alginate impressions. However, ZOE is not usually used if the patient has large undercuts or tuberosities, whereby silicone ...
It is also used in other contexts where an impression similar to a dental impression is needed, such as in audiology (to take ear impressions for fitting custom hearing protection or hearing aids [2]) or in industrial applications (such as to aid in the inspection of interior features of machined parts, for example, internal grooves inside ...
Notice how the line angles of the impression for the inlay are very sharp and precise; this is achieved using carbon-tipped stainless steel instruments. The salmon-colored polyvinylsiloxane impression material is less viscous than the blue and is able to capture better detail for the tooth being restored.
Plaster of Paris is a plaster material used for casting impressions, impression plaster for bite registration consists of plaster of Paris with additives, more water can be added to the powder than with the casting material to provide more flow for taking the impression. [16] These additives hasten the setting time and reduce setting expansion ...
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