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elastic impression materials examples

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endstream endobj 101 0 obj <> endobj 102 0 obj <> endobj 103 0 obj <>stream H‰|VÍnf5}‚ûYÔL'Ž½¥$H¨‹Y V0SFº@¼=Çù½÷S‹ºøzNìØqŽûõˆîOw. 0 Elastic impression materials. VD��ճ(�I.0 ��� �\�`�� ��/�d\�b盀��@$�8��$�v�I��?���r&�k?����8 ��eo u,w * Corresponding author: dubravkamarkovic@yahoo.com . They consist of polymers that bind together in a network of chains that give mate-rial a rubber consistency. An impression material is classified according to specific properties. 2. The impression material of choice would be: A. agar B. alginate C. dental impression compound D. addition silicone B. alginate The impression tray that is used to record the prepared tooth, a bite registration, and an impression of the opposing teeth is a: A. stock tray B. custom tray C. triple tray D. bite registration tray Impression types; Non-Elastic Materials; Prosthodontics. 0000039877 00000 n Current Impression Materials . 2. Rigid impression materials and types • Incapable to record undercut area • Impression plaster fractures on recovery others distorts • Impression plaster • Impression compound • Impression waxes • Zinc oxide eugenol pastes system The base and catalyst are either 2 paste substances or a powder and a liquid (which may be water). 1- Natural gum 2- Spandex or lycra Butyl Rubber (GDP) 4- Fluoroelastomer 5- Elastomers 6- Ethylene-propylene rubber (EPR) 7-Resilin 8- Styrene-butadiene rubber (SBR) 9- Chloroprene 10-Elastin 11- Rubber Epichlorohydrin 12- Nylon Nylon 13- Terpene 14- Isoprene Rubber 15- Poilbutadiene 16- Nitrile Rubber 17- Vinyl stretch 18- Thermoplastic elastomer 19- Silicone rubber 20- Ethylene-propylene-diene rubber (EPDM) 21- Ethylvinylacetate (EVA or foamy gum) 22- Halogenated butyl rubbers (CIIR, BIIR) 2… None of the tested materials allows safe finishing of a complete-arch fixed partial denture on a cast poured from one singl … H‰b``à```a`c`è“aàg@ ~V (Gƒ ÃÅ2†'kV1 ¯ç|Y'.k‹˜ørþ´|±É—]Ù"–5,žùüá*ÏÖÐÐд´ h *³@AA ÄH b`2Y¤5€Xlª(Ó>ÞFÁ‚\øbý…''ä1ýçþÂ\ðÐñ)K膽»Ùf0¸61°„œh:ü™á sã«ÃocnÌXnð#D¤Åá Ä© îu>d endstream endobj 67 0 obj 202 endobj 26 0 obj << /Type /Page /Parent 21 0 R /Resources 27 0 R /Contents [ 30 0 R 32 0 R 34 0 R 36 0 R 38 0 R 47 0 R 53 0 R 55 0 R ] /MediaBox [ 0 0 594 783 ] /CropBox [ 0 0 594 783 ] /Rotate 0 >> endobj 27 0 obj << /ProcSet [ /PDF /Text /ImageC ] /Font << /F43 44 0 R /F44 42 0 R /F45 41 0 R /F46 48 0 R /F47 51 0 R >> /XObject << /Im24 65 0 R >> /ExtGState << /GS1 58 0 R /GS2 59 0 R >> /ColorSpace << /Cs30 28 0 R /Cs31 43 0 R >> >> endobj 28 0 obj [ /Separation /PANTONE#202757#20CVC /DeviceCMYK 61 0 R ] endobj 29 0 obj 1093 endobj 30 0 obj << /Filter /FlateDecode /Length 29 0 R >> stream 0000031577 00000 n Examples: Rubber bands and elastic and other stretchy materials display elasticity. 0000014138 00000 n Your crowns and bridges will fit perfectly, every time again; Always the same superb result. 0000008405 00000 n The material is, therefore, not suitable for use in any undercut situations. Monet’s painting Impression: Sunrise (1872) earned them the initially derisive name “Impressionists” from the journalist Louis Leroy writing in the satirical magazine Le Charivari in 1874. 128 0 obj <>/Filter/FlateDecode/ID[<32D4EC79B97ECAF2B74D8E62968DDF3C><16D10181EB969041A0E02FF1DF129E86>]/Index[100 51]/Info 99 0 R/Length 125/Prev 610082/Root 101 0 R/Size 151/Type/XRef/W[1 3 1]>>stream Impression wax B. 0000005422 00000 n (Table I lists brand names and manufacturers). %%EOF 24 0 obj << /Linearized 1 /O 26 /H [ 1300 308 ] /L 151824 /E 64950 /N 3 /T 151226 >> endobj xref 24 44 0000000016 00000 n 0000002061 00000 n MATERIAL AND METHODS Parti A total of five elastomeric impression materials were evaluated: two polysufides (one lead catalyzed and one copper catalyzed), two silicones (one con- densation polymerization and one addition polymer- ization), and one polyether. They can be categorised into either rigid impression materials (zinc oxide eugenol and impression compound) or elastic impression materials (alginate and silicone). 0000004460 00000 n Impression Materials. Non elastic impression materials ASST PROFESSOR Dr Mumtaz ul Islam B.Sc. The accuracy of four types of impression materials used to make a complete-arch fixed partial denture was evaluated by visual comparison and indirect measurement methods. The two types of material are inelastic and elastic. 0000001815 00000 n endstream endobj startxref 0000006801 00000 n 0000001227 00000 n Impression materials are selected because of their unique qualities that allow dentists to obtain the most accurate reproduction. number of elastic impression materials (polysulphide silicone, and polyether) at different times after setting and to separate the components of the total creep com- pliance in order to better understand the behaviour of these materials under and after the removal of load. Thus, when we consider the pressure during impression taking for dentures, the viscoelastic rheological properties of impression material and the time immediately after seating a tray with the impression material The elastic impression materials are most generally used for the making of impressions for removable partial dentures, immediate dentures, and crowns and fixed partial dentures when tooth and tissue undercuts and surface detail must be recorded with accuracy. ZOE impression paste, impression plaster, and impression compound are inelastic impression materials. MHR. Elastic materials have a soft consistency but after setting, they become elastic. All the duplicating com-poundsare hydrocolloid materials except material B, which is a reversible plastic gel. – Impression materials set by che mical reactions to form elastic rubber materials are called thermoset. Impression plaster C. Vinyl polyether silicone D. Dental impression compound. that the material is a superior or inferior product. The accuracy of these final restorations is highly dependent on the impression materials and techniques utilized. 0000004439 00000 n If the stress under a load becomes too high, then when the load is removed, the material no longer comes back to its original shape and size, but relaxes to a different shape and size: The material becomes permanently deformed. There are four main types of impression material that are routinely used in dentistry. 0000028491 00000 n 0000003351 00000 n Z����3�6o�6?�_w���r9��v~�Y�uCI� stated either high or low viscosity materials produced Learn vocabulary, terms, and more with flashcards, games, and other study tools. Tray modification had little effect on the amount of pressure produced. 0000014554 00000 n The term elastic means that the material is flexible and can be deformed and still return to its original form when unstressed. One technique for recording impressions of undercut areas, commonly used before the advent of elastic materials, was to allow the impression plaster to ‘set’ and then to fracture it in order to facilitate removal from the mouth. h��XmO�8�+��hՍ�_�U%h)�;XD{�IQ>��HmS�Y�����6e��w�����=����P�4��g�Y='\b/�bzI�V�C� 4r�cs They are easy to handle and their accuracy is pretty good. Here is the most elastic material known, different in its chemical composition from rubber and other vegetable gums of similar origin. In fact, it is known that each of the materials is used routinely and gives acceptable results. Start studying Elastomeric Impression Materials. No other material such as polyether or A-silicon will provide the consistency and detail of hydrocolloid. sity for an ideal impression material was the object of intense research. 0000027381 00000 n 1 . 0000043363 00000 n The visco-elastic properties of a number of set elastomeric impression materials were determined using a torsional pendulum apparatus i.e. 0000015793 00000 n It is called Reversible Impression material because of its property of reversing their physical state, which in reusing the impression material for multiple number of impressions. In prosthodontics, impression materials are used to record intraoral structures for the fabrication of definitive restorations. Resistance to this movement is called viscosity.1 The flow characteristics of a material are the basis for the science of rheology.12 The correlation of shear stress and shear rate determines the behavior of the material and can be described as either Newtonian (where viscosity is not affected by shear stress)—of which water is an example—or non-Newtonian. Elastomers are a group of elastic impression materials. 0000001608 00000 n Threehydrocolloid elastic impression materials were selected from thelarge number 0000028413 00000 n In 1874 the group held its first show, independent of the official Salon of the French Academy, which had consistently rejected most of their works. 150 0 obj <>stream Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials? %PDF-1.5 %���� a. polysulfide. Reversible Hydrocolloid is the most precise and detailed impression material available in dentistry. Some examples of viscoelastic materials include amorphous polymers, semicrystalline polymers, biopolymers, metals at very high temperatures, and bitumen materials. 0000011438 00000 n 0000010440 00000 n 0000017268 00000 n 1. 0000015815 00000 n Elastic materials are show's one characteristic, that is it's regain original position after removal of applied force. Impression materials, that is, the materials used to get an idea about the shape of teeth and the alveolar ridges, can be categorized as nonelastic and elastic materials. Metals may display elasticity as atomic lattices change shape and size, again, returning to their original form once energy is removed.

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