Elastomeric Impression Materials: Factors to Consider. – Addition silicone impression materials are also called vinyl polysiloxanes and […] The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. – They are the most accurate, stable, and expensive impression materials. Dental impression making is the process of creating a negative form of the teeth and oral tissues, into which gypsum or other die materials can be processed to create working analogues. The time measured from the start of mixing the impression material to the point where further manipulation will introduce distortion or inaccuracy is called the working time. Elastic impression materials 1. 1. The need for more satisfying impression materials promotes the development of elastomeric impression materials. REVIEW OF DENTAL IMPRESSION MATERIALS R.G. 14 There is usually a correlation between the working and setting times. Impression materials A brief introduction Dr saransh malot 2. The impression taken should be highly precise, thus, requiring specific care when manipulatingthese materials. This … The polyvinyl siloxanes are impression materials used in clinical dentistry due to several factors, such as handling characteristics, physical properties, and dimensional stability 5. This paper describes the development of an instrument for determining consistency, working time and setting time of elastomeric impression materials. Moreover, impressions created with this type of elastomeric impression material can be obtained by different impression … Manipulation of VPS impression materials are critical and needs an understanding to achieve proper impressions. Impression materials Elastic Chemical reactions Irreversible Alginate Elastomers Polysulphides Polyethers Condensation silicon Addition silicon Temperature change Reversible Agar hydrocolloid Chemical reactions Irreversible Plaster of Paris ZnO Eugenol Temperature change Reversible Impression … – They are clean and do not have an unpleasant taste or smell. Physical properties of the impression tray and its manipulation constitute important considerations in the impression process. Write short notes on: 6x5=30marks a) Wanderval forces b) Separating media c) Hydroscopic expansion d) Polymerization reaction Addition Silicones – Addition silicones are the most popular type of elastomeric impression material, especially for crown and bridge impressions. Classify impression materials and discuss in detail about composition, manipulation and properties of elastomeric impression material =10marks 2. 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