write down the name of impression material
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Plaster of Paris (impression plaster) Mainly composed of β-calcium sulphate hemihydrate, impression plaster has a similar composition and setting reaction to the casting material with an increase in certain components to control the initial expansion that is observed with Plaster of Paris.
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Impression materials are used in dentistry to record the details of intraoral structures to fabricate a reproduction of teeth and soft tissues for the construction of dental prostheses.
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