%%EOF Elastomeric Impression materials: 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. 0000003329 00000 n They are widely used in fixed prosthetics because of their good properties. '�#�A��&��{d����Y{ςl�Oa�벸gU]G�${��~?�.��t�M �A1���]���l��pIX4>��/ �By4y^f�(�b��}�=^�g��XǢ��������ty���0B)��Y��q���,}X���x�{J[���ha? number of elastic impression materials (polysulphide silicone, and polyether) at different times after setting and to separate the components of the total creep com- pliance in order to better understand the behaviour of these materials under and after the removal of load. 0000001587 00000 n Elastomers are a group of elastic impression materials. 0000003351 00000 n H‰|VÍnf5}‚ûYÔL'Ž½¥$H¨‹Y V0SFº@¼=Çù½÷S‹ºøzNìØqŽûõˆîOw. Can be used as a one or two … Tray modification had little effect on the amount of pressure produced. Example of elastomeric impression materials include all the following except? 0000017268 00000 n stated either high or low viscosity materials produced The silicone impression materials are classified according to the type of chemical reaction by which they set: Addition; Condensation; Addition silicones. Z����3�6o�6?�_w���r9��v~�Y�uCI� M.Phil. VD��ճ(�I.0 ��� �\�`�� ��/�d\�b盀��@$�8��$�v�I��?���r&�k?����8 ��eo u,w 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 Elastic dental impressions, Introduction to Elastomers, Silicones Silicones. 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. Impression plaster C. Vinyl polyether silicone D. Dental impression compound. 0000004439 00000 n 0000001227 00000 n They consist of polymers that bind together in a network of chains that give mate-rial a rubber consistency. a. polysulfide. 0000030552 00000 n Reversible Hydrocolloid is the most precise and detailed impression material available in dentistry. – The chemical reaction invo lves chain lengthening, cross-linking, or both. MHR. All the duplicating com-poundsare hydrocolloid materials except material B, which is a reversible plastic gel. 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… 0000028568 00000 n trailer << /Size 68 /Info 22 0 R /Root 25 0 R /Prev 151216 /ID[<098c003562edeb9a04e6de3967a1e0b6><0c82e25ef0694463a41ac3783b24a5fa>] >> startxref 0 %%EOF 25 0 obj << /Type /Catalog /Pages 21 0 R /Metadata 23 0 R >> endobj 66 0 obj << /S 128 /Filter /FlateDecode /Length 67 0 R >> stream Impression compound these are all example of what? This classification is based on the capability of the material to withdraw over the undercuts it has set. 0000015815 00000 n Examples include agar, alginate, and elastomers. addition-reaction silicone - Answered by a verified Dentist ... what is classification of under elastic and non elastic impression material, i need enumarte subclassification and name of material and each type sitting time,storge,pouring,thickness need 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. An impression material is classified according to specific properties. Dentaljuce and Prosthodontics - this should go together well. 0000011438 00000 n The term elastic means that the material is flexible and can be deformed and still return to its original form when unstressed. 1 . Examples: Rubber bands and elastic and other stretchy materials display elasticity. The two types of material are inelastic and elastic. Impression Materials. that the material is a superior or inferior product. 0000043363 00000 n Cracking occurs when the strain is applied quickly and outside of the elastic limit. 0000010516 00000 n There are four main types of impression material that are routinely used in dentistry. 0000005422 00000 n In fact, it is known that each of the materials is used routinely and gives acceptable results. 0000006779 00000 n No other material such as polyether or A-silicon will provide the consistency and detail of hydrocolloid. 2. Mechanical property-Indicates the flexibility of a material. A. 0000028413 00000 n Agar Hydrocolloid was the first successful elastic impression material to be used in dentistry. 0000011966 00000 n �.���8@TcF���K�(T����3p�5i) �� �A�!�՗Q���)f�B��g����0?ez�e��R�b�n�}F�pF6�|��.20�g8�T��5�� ��]@l���3 �g�0 ��KI Their good properties material B, which is a Reversible plastic gel is known that each of elastic. C. 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