Polyvinylsiloxanes are elastomers that remain in an elastic or flexible state after they have been removed from the mouth. Impression materials Elastic Chemical reactions Irreversible Alginate Elastomers Polysulphides Polyethers Condensation silicon Addition silicon Temperature change Reversible Agar hydrocolloid Chemical reactions Irreversible Plaster of Paris ZnO Eugenol Temperature change Reversible Impression … 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. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Impression Plaster • used as mucostatic impression material for making final impressions for edentulous patients • Doesn’t compress and displace … Elastic impression materials 1. The elastic recovery value of alginates is around 97%, which indicates less elasticity and therefore less accuracy than agar hydrocolloids and silicone and polyether impression materials. Zinc Oxide Eugenol 4. Impression materials A brief introduction Dr saransh malot 2. of various impression materials, but with a specific test undercut, PVS impression materials have the best elastic recovery at over 99% elastic recovery (Donovan, T.E., & Chee, W.W.L. Impression types Non-Elastic Materials Prosthodontics Dentaljuce and Prosthodontics - this should go together well. # Agar impression materials differ from alginate impressions in that the former sets by : A. Here are the topics Complete Dentures This module will cover complete dentures and include videos, pictures Elastic Impression Materials-Hydrocolloids-Prosthetic Dentistry Lecture note Introduction to Elastic Impression Materials These materials can be stretched and bent to a fairly large degree without suffering any deformation. Impression waxes The first elastic dental impression material was the hydrocolloid, which was introduced to dentistry in 1925.Since then, many elastomeric impression materials have become available, as indicated on … 2004). 2 CHAPTER II. To separate cast from the impression, use warm water. Weston A. 1. A comparison of elastic impression materials James A. Stackhouse, JrD.D.S., M.S. 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. Dental impression materials play a crucial role in your restorative dentistry practice. Faculty of dentistry, Al Andalus University for Medical Science, Tartous, Syria Alginate as impression material Jarkas Manar Abstract There are many materials used to take impressions for patients in dental clinics. History of Agar Impression material: It is was first discovered by Alphous Poller of Vienna in 1925 when he was trying to develop a material that could be sterilized and applied without pressure to the exposed … 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. ZOE impression paste, Elastomers for CD III) Based on their use in dentistry A) Edentulous- For complete denture prosthesis e.g. Other impression materials commonly used in dentistry will be used as a comparison, namely silicones and poly sulfides rubbers. Key Words : Elastic impression materials, accuracy, dimensional stability. These were replaced by elastic impression materials such as aqueous materials (agar, alginate) and nonaqueous elastomers (polysulfides, silicones, and polyethers) ( Figure 2-33 ). 5. Mechanical action of saliva B. In conventional impression, elastic impression materials are used to replicate the anatomy and prosthesis is fabricated indirectly. NON-ELASTIC IMPRESSION MATERIALS NON-ELASTIC IMPRESSION MATERIALS Impression plaster Zinc-oxide eugenol impression paste Impression compound 14 15. The tensile properties of 17 hydrophilic impression materials with different consistencies were compared. Materials and Methods. 12 vinylpolysiloxane, 2 polyether, and 3 hybrid vinylpolyether silicone-based impression … Impression materials are used in dentistry in order to obtain a congruent From: … Impression compound, Impression plaster, Alginate ii) Secondary e.g. i have a viva this coming monday portion is manipulation of Start studying Impression Materials Review. Agar Impression Materials: Forms, Advantages, Manipulation August 2, 2016 A. Dentistry INTRODUCTION Historically, various materials have been used to make impressions for removable and fixed prosthodon-tics. Impression compound 2. 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