USE OF ELASTIC IMPRESSION MATERIALS IN OPERATIVE DENTISTRY. A comparison of elastic impression materials James A. Stackhouse, JrD.D.S., M.S. Dentistry — Elastomeric impression and bite registration materials This document is now under preparation for its final publication. Impression material is of liquid … Learn vocabulary, terms, and more with flashcards, games, and other study tools. Start studying Impression Materials Review. Mechanical action of saliva B. HOLLENBACK GM. Impression Plaster 3. Elastic and plastic properties W . # Agar impression materials differ from alginate impressions in that the former sets by : A. NON-ELASTIC IMPRESSION MATERIALS NON-ELASTIC IMPRESSION MATERIALS Impression plaster Zinc-oxide eugenol impression paste Impression compound 14 15. Impression compound 2. Impression Material Impression materials are used in dentistry to record the details of intraoral structures to fabricate a reproduction of teeth and soft tissues for the construction of dental prostheses. 1. Purpose. Although new elastomeric impression materials have been introduced into the market, there are still insufficient data about their mechanical features. 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. Impression Plaster • used as mucostatic impression material for making final impressions for edentulous patients • Doesn’t compress and displace … 5. Elastic impression materials /certified fixed orthodontic courses by Indian dental academy 1. www.indiandentalacademy.com 2. Here are the topics Complete Dentures This module will cover complete dentures and include videos, pictures ZOE impression paste, Elastomers for CD III) Based on their use in dentistry A) Edentulous- For complete denture prosthesis e.g. 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 … Agar Hydrocolloid was the first successful elastic impression material to be used in dentistry. Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. Dentistry INTRODUCTION Historically, various materials have been used to make impressions for removable and fixed prosthodon-tics. 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 … PMID: 14327171 [PubMed - indexed for MEDLINE] MeSH Terms Calcium Sulfate* Dental the material is non-elastic, so cannot be used in undercut areas. Non-Elastic Impression Materials 1. 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 … Form of the Material – Reversible hydrocolloid ( Agar ) is premixed by the manufacturer and supplied as a semisolid material in tubes and sticks. Dental Materials 2 بجر نابعش ىنثم .م.أ ةيلك – تيركت ةعماج نانسلاا بط Elastic versus Inelastic • Elastic – Flexible – Recover its shape & dimension after removal from the patient mouth • Inelastic – Rigid – Cannot be removed from There are four main types of impression material that are routinely used in dentistry. i have a viva this coming monday portion is manipulation of 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. 1. Zinc Oxide Eugenol 4. E.g. 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. Compatible with cast & die materials & does not need separating medium. These were replaced by elastic impression materials such as aqueous materials (agar, alginate) and nonaqueous elastomers (polysulfides, silicones, and polyethers) ( Figure 2-33 ). Containers of alginate such as cans or plastic containers should be turned end-over-end a few times to Impression compound, Impression plaster, Alginate ii) Secondary e.g. Impression materials are understood as compositions which pass from a plastic state into a hard or elastic state by means of a hardening process. Dental impression materials play a crucial role in your restorative dentistry practice. Ease of Handling:Along with this method of measuring the flexibility/stiffness property ranges of materials so as to determine whether the set materials, when formed as impressions, 1) can … It has been reported that polyether materials yielded consistently superior stability when com- pared 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 … INDIAN DENTAL ACADEMY Leader in continuing dental education www 2004). 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. Elastic impression materials 1. F i n g e r 1, M. K o m a t s u 2 1Department of Prosthetic Dentistry and Dental Technology, Dental School of the RWTH, Aachen, W, Germany and 2Department of of elastic dental Operative Dentistry, Dental School, Tohuku University, Sendal, Japan impression materials Finger W, Komatsu M. Elastic and plastic properties of elastic dental impression materials. Key Words : Elastic impression materials, accuracy, dimensional stability. Impression compound Other impression materials commonly used in dentistry will be used as a comparison, namely silicones and poly sulfides rubbers. 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