Recently, new elastomeric impression materials have been introduced, with the claim of very high elastic recovery and high tear and tensile strengths. elastomeric impression materials must be able to reproduce fine detail of 25 μm or less. – Addition silicone impression materials are a lso called vinyl polysiloxanes and – They are clean and do not have an unpleasant taste or smell. An electronic search of the Scopus and PubMed databases was performed in November 2010. Types of elastomeric impression materials Composition Setting reaction Advantages and disadvantages #NEETMDS #dentistry #dentalmaterials 13. Conclusion: Overall contemporary retraction materials showed low potential for polymerization inhibition of elastomeric impression materials. PVS impression materials can make details of even 1 to 2μm. – Hydrocolloid impression materials are quite hydrophilic, but the same cannot be said for all impression materials. This paper describes the development of an instrument for determining consistency, working time and setting time of elastomeric impression materials. With elastomeric impression materials such as polyvinyl siloxane, polyether, and polysulfide, the dimensional accuracy is usually time dependent, with greater dimensional accuracy occurring immediately after polymerization is complete but declining as the impression is stored for extended periods of time . The visco-elastic properties of a number of set elastomeric impression materials were determined using a torsional pendulum apparatus i.e. Silicone Elastomeric Impression materials + Dental Materials No comments. 3- Heavy body. er efore, the impression technique needs to be modi ed. Wilson, H. J.; Elastomeric impression materials. It is also known as Mercaptan or Thiokol. General Comments – Impression materials are used to make replicas (models or casts) of t eeth and other oral tissues. non aqueous elastomeric impression materials. Elastomeric impression materials have been marketed for optimizing direct digital acquisition without requiring a stone cast. Base paste (white) Accelerator (brown/grey) Available in 3 viscosities: Light bodied; Medium bodied; Heavy bodied; Composition: Base paste: Each of the materials has advantages and disadvantages, but they are each used for a different purpose and are effective and commonly used products in dentistry today. ELASTOMERIC IMPRESSION MATERIALS The impression materials discussed so far are not good enough generally for taking accurate impressions of the dental patient. One of the disadvantages of the silicone impression materials (including condensation silicones) is their inherent hydrophobic nature. silicone → This is the most popular type of elastomeric impression material. elastomeric materials: silicones (polyvinyl siloxane): condensation-cured silicones, addition silicones, vinyl polyether silicones (VPES) polyethers ; polysulphides; rigid materials: plaster of Paris; impression compound; zinc oxide and eugenol-based impression paste; Techniques for taking impression. Addition Silicones – Addition silicones are the most popular type of elastomeric impression mat erial, especially for crown and bridge impressions. True False . Setting occurs in room temp , so called as RTV silicones. Purpose: This study investigates the modulus of elasticity, yield strength, the strain at yield point, and the tear energy of nine elastomeric impression materials. Purpose. they often require special equipment to prepare. It was the first type of silicone impression material. Start studying impression materials elastomers. (ZOE) or elastomeric impression materials because of the inherent accuracy of these materials and their propensity to distribute pressure equally [ ]. The purpose of this in vitro study was to compare the trueness and precision of digital dental casts obtained from the direct digitization of 2 … As the residual ridges resorb, the tissues become unsupported and displaceable; the use of conventional impression techniques will result in a distorted impression. elastomeric impression materials on repeated pours would suggest that addition silicones and polyethers to a certain extent were least affected with delay in pouring the impression. These are high precision and essential for impressions that will be used for the fabrica-tion of indirect restorations and laboratory fabricated aligners. Disadvantages of reversible Hydrocolloid-A lot of equipment -Inaccurate and distorted impression when the tray is removed from the mouth too soon, improper removal or inadequate amount of material in tray.-Grainy material caused by insufficient boiling or keeping the storage temperature too low. Research Article Mechanical Properties of Elastomeric Impression Materials: An In Vitro Comparison DinoRe, 1 FrancescoDeAngelis, 2 GabrieleAugusti, 1 DavideAugusti, 1 SergioCaputi, 2 MaurizioD Amario, 3 andCamilloD Arcangelo 2 Department of Oral Rehabilitation, Istituto Stomatologico Italiano, University of Milan, Milan, Italy POLYSULFIDE ELASTOMERIC IMPRESSION MATERIAL: First elastomeric impression material to be introduced, also known as mercaptan / thymol, it is a type of Rubber based impression material. Author: R Gibbons, RDN, PTTLS Br Dent J 121:277, 1966. Impression Materials A. 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