manipulation of elastomeric impression materials

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The polyvinyl siloxanes are impression materials used in clinical dentistry due to several factors, such as handling characteristics, physical properties, and dimensional stability 5. Elastic impression materials 1. The impression taken should be highly precise, thus, requiring specific care when manipulatingthese materials. – 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. 14 There is usually a correlation between the working and setting times. Addition Silicones – Addition silicones are the most popular type of elastomeric impression material, especially for crown and bridge impressions. 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 … 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. Write short notes on: 6x5=30marks a) Wanderval forces b) Separating media c) Hydroscopic expansion d) Polymerization reaction This paper describes the development of an instrument for determining consistency, working time and setting time of elastomeric impression materials. The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. 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 … Impression materials A brief introduction Dr saransh malot 2. Elastomeric impression materials are in common use. Classify impression materials and discuss in detail about composition, manipulation and properties of elastomeric impression material =10marks 2. This … 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. The need for more satisfying impression materials promotes the development of elastomeric impression materials. 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. 1. REVIEW OF DENTAL IMPRESSION MATERIALS R.G. Elastomeric Impression Materials: Factors to Consider. – 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. – They are the most accurate, stable, and expensive impression materials. Stable, and expensive impression materials are also called vinyl polysiloxanes and [ … REVIEW... ] REVIEW of DENTAL impression materials and discuss in detail manipulation of elastomeric impression materials composition manipulation... 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