Elastomeric impression materials silicone chemical. Recently, new elastomeric impression materials with very high elastic recovery and high tear strength have been introduced. The y are based on silicone rubber, which is com monly used in other industries. Often, polysulfide materials are called rubber or rubber base materials, even though polyether and silicone materials are also rubber materials. Because elastomeric impression materials have so many physical and mechanical components, selecting the proper one for a given application can be quite tedious.
Elastomeric impression materials such as polysulphide, the silicones and polyether chap. Some pdf files are protected by digital rights management. Debubblizers, a dilute solution of soap wettability of the silicone impression material for the stone slurry excellent dimensional stability of addition silicone and polyether impression construct two or. 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. The selective impression technique is recommended for removable prosthodontics. Major advances in impression materials and their application have occurred during the last decade, with greater emphasis being placed on rubber impression materials than on dental compound, zinc oxideeugenol, and agar and alginate. Ansiada192018 elastomeric impression materialscustomer service. Associate professor, sinhgad dental college, vadgaon bk, pune 411041. General comments impression materials are used to make replicas models or casts of teeth and other oral tissues. Research article mechanical properties of elastomeric impression materials.
Impression materials and techniques pocket dentistry. Tensile strength at break tsb, yield strength ys, ultimate strain at break usb, and strain at yield point sy of seventeen commercially available elastomeric impression materials with heavy hb, medium mb, or lightbody lb consistencies were evaluated in this study. Condensation silicones condensation silicone impression materials were the next elastomeric impr ession material to be developed for dentistry. Solutions are provided to common problems encountered by the clinician in producing good. Rheological properties of elastomeric impression materials for selective pressure impression technique. C, 4,5,12,17,22 others 35o c 26, and some followed specification number 19 of the ada, which considers 32oc2,14,18,27. The table provides data on three of the most important mechanical properties for four elastomeric impression materials.
Accuracy of newly formulated fastsetting elastomeric impression materials. They are hydrophobic, and the setting process is the re sult of a condensation reaction. The qualities of impressions and the biocompatibility of impression materials shows effect of disinfection solution is the major issue. Clinical acceptance of singleunit crowns and its association with impression and tissue displacement techniques. Sep 15, 2017 all elastomeric impression materials are viscoelastic, and it is necessary to use a quick snap to minimize plastic deformation 82 83. Four silicones examixfine, exadenture, coltex, and president, one polyether. Comparison of elastomeric impression materials thixotropic behavior article pdf available in the european journal of prosthodontics and restorative dentistry 212. The accuracy of these final restorations is highly dependent on the impression materials and techniques utilized. Impression material is packaged several ways for preference of use. Elastomeric impression materialsthe need of the hour. Research article mechanical properties of elastomeric.
Craig university of michigan school of dentistry ann arbor, michigan summary creep compliance measurements were shown to be effective in characterizing the elastic, retarded elastic, and viscous properties of. The dimensional stability of elastomeric dental impression materials contemporary materials, iii 1 2012 page 107 of 110 ding to the instructions 100. Revised american national standard american dental. Rheological properties of elastomeric impression materials. Viscoelastic properties of elastomeric impression materials. Impression materials immediately after mixing were placed on themeasuring plate, and gap between plates sample thickness was set at 0. Dimensional stability of elastomeric impression materials.
Elastomeric impression materials ether cross link free. Recent advances in elastomeric impression materials. Impression materials and laboratory procedures pocket. These supporting structures include gingiva, alveolar bone or residual ridge, hard and soft palate, and frenums, which are muscle attachments. Elastomeric impression materials offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. However, the viscoelastic rheological properties of impression materials, particularly the timedependent viscoelastic changes in impression material immediately after tray seating, are unknown. These are high precision and essential for impressions that will be used for the fabrication of indirect restorations and laboratory fabricated aligners. Tenyear retrospective study of the effectiveness of quantitative percussion diagnostics as an indicator of the level of structural pathology in teeth. Elastomeric impression materials addition silicones and polyethers offer high elastic recovery and. Elastomeric impression materials the need of the hour. Since many decades, a numbers of impression materials, both rigid and elastic are being used. Elastomeric impression materials free download as powerpoint presentation. 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. 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.
Since last decade there are major advances in impression materials and their application with more importance on rubber impression materials than rigid materials. Scribd is the worlds largest social reading and publishing site. 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 linkedin slideshare. Feb 19, 2015 regardless of type all elastomeric impression materials are supplied as two components system. As the material is reversible, it can be reused, but after sterilization. This study evaluated physical properties and additional characteristics of six commercial elastomeric impression materials and effect of a silicone remover on peel bond strengths between impression materials and an acrylic resin tray. Nonaqueous elastomeric impression materials nonaqueous elastomeric impression materials include polysulfide, polyether, condensation silicone, and addition silicone vinyl polysiloxane. Abstract recent advances in impression materials and stock edentulous impression trays have resulted. Recently, new elastomeric impression materials have been introduced, with the. Mechanical properties of elastomeric impression materials.
A comparison of methods for determining working and setting times. Elastomeric impression technique for complete denture impressions venigalla naga venu madhav1, prabhudesai2 1. Regardless of type all elastomeric impression materials are supplied as two components system. The all pourpose dental impression material puneet anand, dr. All elastomeric impression materials are viscoelastic, and it is necessary to use a quick snap to minimize plastic deformation 82 83. Of particular interest has been the effect of disinfection solutions on the. Several authors have simulated the conditions of temperature and humidity that are found in clinical practice. More precise information on each element required for performing the test is given. These are to be proportioned for mixing according to the length of the extruded rope, either of one part when the other reactant is in a liquid to be dispensed by counting drops, or for. Comparison of elastomeric impression materials used in fixed. Rheological properties of elastomeric impression materials for selective pressure impression technique misao kawara dds, phda, masatoshi iwasaki ddsb, yoshihiro iwata ddsb, yoshihiro komoda ddsb, sayumi inoue ddsb, osamu komiyama dds, phda, hiroshi suzuki dds, phda, toshikazu kuroki dds, phda, kaname hashizaki phdc a department. Elastomeric impression materials by dr rashid hassan for more lectures on dental materials visit.
Professor, bharati vidyapeeth dental college, pune 411043. Polymer high shrinkage filled polymer low shrinkage impression during setting shrinkage, distortion of impression is toward tray. 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. Click here to purchase the full version from the ansi store. Comparison of elastomeric impression materials used in. The synthetic elastomeric materials in general meet these high demands. Physical properties and additional characteristics of. A rationale is put forward for the choice of elastomeric materials. Findings from the national dental practicebased research network. Nontoxic or irritant suitable setting time long shelf life. Dental impression materials premarket notification. Application condensation silicon impression materials are commonly used for crown and.
Pdf surface properties of elastomeric impression materials. Base and catalyst light and regular body materials supplied in cartridges to be used with auto mixing tips and dispensers. The elastomeric impression materials are available in a range of viscosities, depending on the amount of filler that is incorporated. Impression material an overview sciencedirect topics. Elastomeric impression materials have an elastic or rubberlike quality after setting.
Elastomeric impression material mechanical properties detail reproduction. Surface properties of elastomeric impression materials. Accuracy of newly formulated fastsetting elastomeric. In prosthodontics, impression materials are used to record intraoral structures for the fabrication of definitive restorations. Jan 09, 2015 an ideal impression material should also have good elastic recovery when it is used in undercut situations and should have good tear resistance. Standards store are in electronic adobe acrobat pdf format. Elastomeric impression materials flashcards quizlet. Dental impression materials and techniques article pdf available in dental clinics of north america 614.
Elastomeric impression materials addition silicones and polyethers offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. Jan 31, 2016 elastomeric impression materials by dr rashid hassan for more lectures on dental materials visit. Pdf accuracy of newly formulated fastsetting elastomeric. In dentistry, we take impressions of teeth and their supporting structures. The elastomeric impression materials available are silicones addition and condensation cured and polyethers.
The impression taken should be highly precise, thus, requiring specific care when manipulatingthese materials. To separate cast from the impression, use warm water. Since many decades, a numbers of impression materials. Pdf comparison of elastomeric impression materials. The objective of this study is to clarify the viscoelastic rheological properties of impression. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
An ideal impression material should also have good elastic recovery when it is used in undercut situations and should have good tear resistance. Dental impression material is a class ii device composed of materials such as alginate or polysulfide intended to be placed on a preformed impression. Percentage of deviation as a function of time for five elastomeric impression materials with the use of a custom tray. Much thicker materials used to fill an impression tray. July 11, 2017polysulfide impression material polysulfide impression material was the first non aqueous elastomeric rubber impression material developed for dentistry. The tensile properties of 17 hydrophilic impression materials with different consistencies were compared. The ideal impression material should exhibit adequate mechanical properties to withstand stresses under various clinical scenarios. Based on the backbone of polymer chains elastomers polysulfide silicones polyethers 109 110. Elastomeric impression materials are in common use. Although new elastomeric impression materials have been introduced into the market, there are still insufficient data about their mechanical features.
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