elastomeric impression materials slideshare

It is found that … Learn vocabulary, terms, and more with flashcards, games, and other study tools. This instrument has been called a … Table 2. Recently, new elastomeric impression materials have been introduced, with the claim of very high elastic recovery and high tear and tensile strengths. PVS impression materials can make details of even 1 to 2μm. 19 - non-aqueous elastomeric dental impression materials. o As per ADA Sp. When an extruder is used, the impression material is mixed ___. 1. polysulfide. The impression taken should be highly precise, thus, requiring specific care when manipulatingthese materials. Elastomeric impression materials are available in two-paste system, as base paste and reactor liquid, two putty system and/or base putty and a reactor liquid. Purpose: This study investigates the modulus of elasticity, yield strength, the strain at yield point, and the tear energy of nine elastomeric impression materials. Condensation Silicones – Condensation silicone impression materials were the next elastomeric impr ession material to be developed for dentistry. Braz J Oral Sci. An ideal impression material should also have good elastic recovery when it is used in undercut situations and should have good tear resistance. of nonaqueous elastomeric impression materials over time and on exposure to various environmental conditions. A group of flexible chemical polymers which are either chemically or physically cross linked. Abstract Recent advances in impression materials and stock edentulous impression trays have resulted It is made by placing an appropriate material in a stock or custom dental impression tray which is designed to roughly fit over the dental arches. Dimensional accuracy of stone casts made by a monophase impression technique using different elastomeric impression materials. It is also apparent from Figs 2 and 3 that some materials such as the polysulphides have substantial changes in properties with time after setting compared to the silicone or polyether impression materials. Three different types of elastomeric impression materials were selected as representative of the materials currently used. Addition Silicones – Addition silicones are the most popular type of elastomeric impression material, especially for crown and bridge impressions. 3. a stock tray with a medium viscosity elastomeric impression material to pickup the matrix impression and the remaining arch not covered by the matrix. – They are the most accurate, stable, and expensive impression materials. – Addition silicone impression materials are also called vinyl polysiloxanes and […] the same type of impression material. There are 4 groups of elastomers; polysulfide, condensation silicone, addition silicone and polyether; each differ in their setting mecha … 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 In addition some new elastomeric impression materials with improved properties and a new (experimental) light-cured impression material, are mentioned. – An alcohol by-product rather than water is formed. 2. a high viscosity elastomeric impression material, which will preferably bond to the matrix-forming material, required to make an impression of the preparations in the matrix. Viscosity is also an important property of a material for the precise impression in a cast. 2 Normative references. as it moves through the mixing tip. elastomeric impression materials must be able to reproduce fine detail of 25 μm or less. Elastomeric. The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. This material commonly involves the use of … This … The elastomeric impression materials available are silicones (addition and condensation cured) and polyethers. To support my research on impression materials I asked two dentists their opinions on the different impression materials: Silicones are the most dimensionally stable of all the materials and will keep their shape even if left for long periods. The clinical significance of these materials, physical and mechanical properties are also emphasized. Materials and methods: The values of the first three variables were computed from a tensile load test of 10 dumbbell-shaped specimens of each impression material. In this study, we examined the rheological properties of elastomeric impression materials, both before and during setting, to assess the clinical significance of certain key characteristics such as viscosity, pseudo-plasticity, and the rate of development of elasticity. Permlastic is a polysulfide, condensation-cured, elastomeric impression material in three viscosities. shows the properties of different elastomeric impression materials. Elastomeric impression materials are in common use. The synthetic elastomeric materials in general meet these high demands. – They are hydrophobic, and the setting process is the re sult of a condensation reaction. The tubes of catalyst and base are interchangeable if they are ___. Impression Materials o In addition to hydrocolloids – another group - Elastomers. This International Standard specifies requirements and tests for evaluating elastomeric dental impression materials. Another part of this article is the biocompatibility of these materials. The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. Professor, Bharati Vidyapeeth Dental College, Pune 411043. Elastomeric impression materials offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth . Precleaning removes additional bioburden and any adherent impression materials. a. Associate Professor, Sinhgad Dental College, Vadgaon (Bk), Pune 411041. . The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. A dental impression is a negative imprint of hard (teeth) and soft tissues in the mouth from which a positive reproduction (cast or model) can be formed. Single-use, plastic impression trays provide a disposable alternative to heat sterilization. No. This is one of the four types of impression materials discussed in Chapter 8, Impression Materials. DEFINITION OF ELASTOMERIC IMPRESSION MATERIAL. Materials investigated included a polyether impression material, a polysulfide material (light, regular and heavy consistencies) and an addition-reaction silicone material (light, regular, heavy and putty consistencies). MODELING PLASTIC--CHARACTERISTICS. Each impression material was mixed according to manufacturer’s instructions. Objectives: Aim of this study was to investigate the depth reproduction of differently wide sulci with elastomeric impression materials by single- and double-mix techniques using a tooth and sulcus model, simulating clinical conditions. Specimens 20 mm × 10 mm × 2 mm were prepared by compressing the elastomeric material in a mold and glass slide. Start studying Dental Materials Ch 21 Disinfection of Impressions & Ch 30 Elastomeric Impressions. Mechanical and physical properties of elastomeric impression materials. However, silicones work best in a dry environment and may not be ideal if there is a lot of saliva. Consistent with dental infection-control guidelines for semicritical instruments, chrome-plated and aluminum impression trays can be cleaned, packaged, and heat-sterilized. of the material; for example material E is much nearer to perfect elasticity than material A although the latter is more flexible. elastomeric materials. Markus Balkenhol, Sylvia Haunschild, Christina Erbe, Bernd Wöstmann, Influence of prolonged setting time on permanent deformation of elastomeric impression materials, The Journal of Prosthetic Dentistry, 10.1016/S0022-3913(10)60060-1, 103, 5, (288-294), (2010). Get free dental books, notes, and more dental videos by participating in a short survey. This paper describes the development of an instrument for determining consistency, working time and setting time of elastomeric impression materials. – They are clean and do not have an unpleasant taste or smell. This paper describes the development of an instrument for determining consistency, working time and setting time of elastomeric impression materials. 2. Impression materials were submitted to the following treatments: immersion in 5.25% sodium hypochlorite solution for 10 minutes, immersion in 2% glutaraldehyde solution for 30 minutes, and no immersion (control). Regular Permlastic is recommended for partial- or full denture impressions because it has a high degree of flow that will register the finest detail. 2011 Sep;10(3):175–9. – The y are based on silicone rubber, which is com monly used in other industries. This chapter addresses the manipulation of addition silicone (polyvinylsiloxanes or polysiloxanes) impression material. 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. Wadhwa SS, Mehta R, Duggal N, Vasudeva K. The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials. ELASTOMERIC IMPRESSION TECHNIQUE FOR COMPLETE DENTURE IMPRESSIONS Venigalla Naga Venu Madhav1*, Prabhudesai2 1. After treatments, impressions were poured, and Modeling plastic (modeling composition) is an impression material (thermoplastic type) which can be softened by heat into a soft plastic mass and then. An Impression material is the substance used to achieve a negative reproduction of the soft and hard tissues of the oral cavity, to attain the perfect reproduction of the Oral cavity the Impression material needs to have certain ideal Properties to achieve the perfect impression or reproduction of the patients oral cavity and tooth or teeth in question. 3-22. The introduction of elastomeric impression materials [Skinner and Cooper, J Am Dent Assoc 51:523-536, 1955] has made possible new techniques of recording impression for … , thus, requiring specific care when manipulatingthese materials of catalyst and base are interchangeable if are... Elasticity than material a although the latter is more flexible manipulatingthese materials Standard! Dental infection-control guidelines for semicritical instruments, chrome-plated and aluminum impression trays can be used with Light-Bodied Permlastic crown! 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