This paper describes the development of an instrument for determining consistency, working time and setting time of elastomeric impression materials. Write short notes on: 6x5=30marks a) Wanderval forces b) Separating media c) Hydroscopic expansion d) Polymerization reaction REVIEW OF DENTAL IMPRESSION MATERIALS R.G. Elastomeric impression materials are in common use. Elastic impression materials 1. CRAIG Department of Biomaterials, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109 Adv Dent Res 2(l):51-64, August, 1988 ABSTRACT Major advances in impression materials and … The polyvinyl siloxanes are impression materials used in clinical dentistry due to several factors, such as handling characteristics, physical properties, and dimensional stability 5. 14 There is usually a correlation between the working and setting times. 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 … There are 4 groups of elastomers; polysulfide, condensation silicone, addition silicone and polyether; each differ in their setting mechanism and their physical and chemical properties. – Addition silicone impression materials are also called vinyl polysiloxanes and […] 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. Moreover, impressions created with this type of elastomeric impression material can be obtained by different impression … Elastomeric Impression Materials: Factors to Consider. The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. Manipulation of VPS impression materials are critical and needs an understanding to achieve proper impressions. – They are clean and do not have an unpleasant taste or smell. The impression taken should be highly precise, thus, requiring specific care when manipulatingthese materials. 1. Classify impression materials and discuss in detail about composition, manipulation and properties of elastomeric impression material =10marks 2. Addition Silicones – Addition silicones are the most popular type of elastomeric impression material, especially for crown and bridge impressions. Impression materials A brief introduction Dr saransh malot 2. – They are the most accurate, stable, and expensive impression materials. 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