Elastic impression materials can be further divided into hydrocolloid and elastomeric impression. Professor, bharati vidyapeeth dental college, pune 411043. The effect of pouring time on the dimensional accuracy of casts made from different irreversible hydrocolloid impression materials. Product catalogue dmp manufacturer of dental materials. Polysulfides at the beginning of the fifties 1950, were the first elastomeric impression material used in the world of dentistry. Dimensional accuracy of stone casts made by a monophase impression technique using different elastomeric impression materials. Comparison of elastomeric impression materials used in fixed. These materials have a much lower chance of permanent deformation when removed and are able to reproduce the surface detail very accurately, but they are hydrophobic and. A total of five elastomeric impression materials were evaluated. Feb 19, 2015 history after world war ii, advances in polymer technology brought to the dental profession a group of synthetic rubbery materials called elastomers. The impression taken should be highly precise, thus, requiring specific care when manipulatingthese materials.
Elastomeric impression materials silicone chemical compounds. Sep 15, 2017 an impression material sustains some deformation as it is removed from the mouth but it must rebound to its pre removal dimensions. Elastomeric impression materials addition silicones and polyethers offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. To record accurate e dimension of oral tissues and their spatial relationships. An impression material sustains some deformation as it is removed from the mouth but it must rebound to its pre removal dimensions. Phillips science of dental materials 11th edition pdf. 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.
One step technique light body material load a syringe and inject around. Characteristics of elastomeric impression materials. Adhesion of elastomeric impression materials to trays. A comparison of the accuracy and dimensional stability of. Many factors are important in choosing a materi al. Associate professor, sinhgad dental college, vadgaon bk, pune 411041. Pdf the historical evolution of dental impression materials. History after world war ii, advances in polymer technology brought to the dental profession a group of synthetic rubbery materials called elastomers.
A polyvinyl siloxane impression material was used to take a full arch impression. Nonaqueous impression materials impression techniques. The elastic properties of these elastomeric impression materials improve with an increase in curing time in the mouth. Recently, new elastomeric impression materials have been introduced, with the claim of very high elastic recovery and high tear and tensile strengths. It has been accepted for inclusion in masters theses by an authorized administrator of loyola ecommons.
Ppt impression materials powerpoint presentation free to. Research article mechanical properties of elastomeric impression materials. Jan 31, 2016 elastomeric impression materials by dr rashid hassan for more lectures on dental materials visit. Elastomeric impression materials comprise a group of synthetic polymer based impression materials that are chemically crosslinked when set and can be stretched rapidly recover to their original dimensions 108 109. The accuracy of these final restorations is highly dependent on the impression materials and techniques utilized.
Impression material an overview sciencedirect topics. Phillips science of dental materials 1996 51 impression material usage civilian general dentists. An impression with a sufficiently high elastic limit should not sustain permanent deformation. Dental impression material is a class ii device composed of materials such as alginate or polysulfide intended to be placed on a preformed impression tray and used to reproduce the structure of a. Elastomeric impression materials are in common use. The tensile properties of 17 hydrophilic impression materials with different consistencies were compared. If the document is revised or amended, you will be notified by email. Phillips science of dental materials 11th edition pdf for free. The chemical reaction invo lves chain lengthening, crosslinking, or both. These are basically synthetic rubber based materials which were initially called as rubber impression materials but currently they are known as non aqueous elastomeric impression materials. Mechanical properties of elastomeric impression materials.
Elastomeric impression materials article pdf available in refu. Pdf manipulation of elastomeric impression materials. President regular body had the highest degree of accuracy of the elastomeric impression materials. Base and catalyst light and regular body materials supplied in cartridges to be used with auto mixing tips and dispensers. Research article mechanical properties of elastomeric. Elastomeric impressions vps, an addition reaction silicone impression material or csilicone impression material, offers a number of distinct advantages for making definitive impressions during complete denture therapy, including. How we discovered the real reason nice guys dont get laid, and a simple fix that allows you to gain the upper hand with a girl.
Elastic impression materials, accuracy, dimensional stability. Pdf compatibility of elastomeric impression materials. Abstract recent advances in impression materials and stock edentulous impression trays have resulted. Ciesco loyola university chicago this thesis is brought to you for free and open access by the theses and dissertations at loyola ecommons. These properties are important in choosing a material. Turner dental school, university of manchester, manchester, u. To simplify the selection process, clinicians should look for a smoothflowing, hydrophilic material that has good tear strength, shrinks very little upon setting, and can be poured. However, impression compound is useful for checking cavity preparations for undercuts and for making impressions of full crown preparations where gingival tissues. The aim of the present study was to assess the accuracy of multi. Elastomeric impression materials addition silicones and polyethers offer high elastic recovery and. Often, polysulfide materials are called rubber or rubber base materials, even though polyether and silicone materials are also rubber materials. Documents sold on the ansi webstore are in electronic adobe acrobat pdf format, however some iso and iec standards are available. Elastomeric impression materials free download as powerpoint presentation.
A comparison of methods for determining working and setting times. Dental impressions can increase the transmission of microorganisms and infections. Elastomeric impression materials by dr rashid hassan for more lectures on dental materials visit material lecturesbydrrash. Much thicker materials used to fill an impression tray. The aim of the study is to investigate the polymerization inhibition of elastomeric impression materials vinylpoly siloxane vps and polyether pe when used in.
Dimensional stability of seven elastomeric impression materials. Properties of elastomeric impression materials the dental advisor. The objective of this study is to clarify the viscoelastic rheological properties of impression materials by focusing on. Polyvinyl siloxane impression materials require an absolutely dry field for an acceptable impression, as is true of all elastomeric impression materials. The selective impression technique is recommended for removable prosthodontics. The effects of crosslinking agent and surfactant on the tear strength of novel vinyl polysiloxane impression materials shahab ud din. Accuracy of a new elastomeric impression material for. Elastomeric impression materials typically consist of separate base and catalyst. General aspects of nonaqueous elastomeric rubber impression materials a number of rubberlike impression materials have b een developed for dentistry. Elastomeric materials are used to produce a variety of products, for example. A material that is used when an extremely accurate impression is essential. Dental impression materials premarket notification. Elastomeric impression materials offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth.
Although new elastomeric impression materials have been introduced into the market, there are still insufficient data about their mechanical features. Polyvinyl siloxane an overview sciencedirect topics. Elastomeric impression materials flashcards quizlet. What is elastomeric impression materials igi global. Rheological properties of elastomeric impression materials. The polymerized impression is somewhat rigid, but this rigidity is nowhere that of the polyether materials and is not a major problem. However, the viscoelastic rheological properties of impression materials, particularly the timedependent viscoelastic changes in impression material immediately after tray seating, are unknown.
Based on the backbone of polymer chains elastomers polysulfide silicones polyethers 109 110. The purpose of this study was to assess the influence of three disinfectant. Regardless of type all elastomeric impression materials are supplied as two components system. The ideal impression material should exhibit adequate mechanical properties to withstand stresses under various clinical scenarios. Following are the important qualities the clinician should expect to find in their elastomeric impression material. View enhanced pdf access article on wiley online library html view download pdf for offline viewing. This website provides free medical books this website provides over 0 free medical books and more for all students and doctors this website the best choice for medical students during. Elastomeric impression materials polysulfide hydrophobic silicones polyether hydrophilic condensation silicone.
These materials set via polymerization rea ctions and are more. Surface properties of elastomeric impression materials. July 11, 2017polysulfide impression material polysulfide impression material was the first non aqueous elastomeric rubber impression material developed for dentistry. Impression compound zinc oxide eugenol impression paste plaster of paris. Recently, new elastomeric impression materials with very high elastic recovery and high tear strength have been.
Elastomeric impression materials silicone chemical. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The term elastomeric means having elastic or rubberlike qualities. Two step technique or putty wash take primary impression using putty cut away material above prepped tooth. Aug 02, 2016 impression materials set by che mical reactions to form elastic rubber materials are called thermoset. A variety of names are used to describe this group of materials. A light body material was injected around the margins figure 163, a as the impression tray was loaded with a heavy body material figure 163, b. Compatibility of elastomeric impression materials for use as soft tissue casts. Elastomeric impression technique for complete denture impressions venigalla naga venu madhav1, prabhudesai2 1. Rigid impression materials include plaster and compozinc oxideeugenol. 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. Four classes of elastomeric impression materials polysulfide, polyether, silicone, and agaragar were evaluated on the basis of linear dimensional stability as a function of time between taking.
Elastomeric impression material mechanical properties detail reproduction. These materials are often used as an interocclusal registration material. Accuracy and dimensional stability of elastomeric impression materials. The tray was seated figure 163, c and the material was allowed to set completely before it was removed from the patients mouth. Comparison of elastomeric impression materials thixotropic behavior article pdf available in the european journal of prosthodontics and restorative dentistry 212. The impression material is used in the first phase, and any inaccuracy is carried through to the finished casting. Other impression materials set by a physical change when they cool, either by solidification or by gelation. Accuracy of newly formulated fastsetting elastomeric impression materials. Article in hebrew levartovsky s1, folkman m, alter e, pilo r. Scribd is the worlds largest social reading and publishing site.
Nov 26, 2015 elastomeric impression materials offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. 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. Elastomeric impression materials are currently one of the most popular options for definitive impressions in fixed prosthodontics. They can be used as the lining of vessels or tanks, coatings of materials and waterresistant roofing.
Elastomeric impression materials offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth 6. 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, pseudoplasticity, and the rate of development of elasticity. Elastomeric impression materials rheology silicone. Comparison of elastomeric impression materials thixotropic behavior. In prosthodontics, impression materials are used to record intraoral structures for the fabrication of definitive restorations. Pdf accuracy of a new elastomeric impression material. Hydrocolloid materials include agar, which is reversible, and alginate, which is.
Manufacturers provide a series of materials from which to choose that possess different. An update on elastomeric impression materials british. The table provides data on three of the most important mechanical properties for four elastomeric impression materials. Recently, new elastomeric impression materials have been introduced, with the. Pdf comparison of elastomeric impression materials. These studies did not take into consideration the influence of intraoral moisture and temperature, which could affect the evaluation of accuracy of the impression materials. Use syringe and inject light body around prepped tooth and reseat primary impression. Evaluation of some properties of elastomeric dental. A comparison of the accuracy and dimensional stability of five elastomeric impression materials james n. The need for more satisfying impression materials promotes the development of elastomeric impression materials. Because elastomeric impression materials have so many physical and mechanical components, selecting the proper one for a given application can be quite tedious. Please first verify your email before subscribing to alerts your alert profile lists the documents that will be monitored. Silicone or polyether materials used to obtain an accurate replica of the hard and soft tissue for the fabrication of patient diagnostic and working casts. Our policy towards the use of cookies techstreet, a clarivate analytics brand, uses cookies to improve your online experience.
1452 1630 319 701 875 855 1354 1014 1373 201 1254 558 431 950 1416 916 1329 292 1009 1493 1227 1323 1320 1113 230 1512 546 1225 1552 577 848 341 562 780 632 1013 111 1498 672 36 889 175 914 1473