Start studying Dental Materials - Impression Materials. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 2. The property of a material to have two different temperatures for melting and solidifying, unlike water, which has one temperature for both. A correctly made dental impression will capture a part or all of a person's dentition and surrounding structures of oral cavity. Technique, accuracy, taste, ease of manipulation, cost, dimensional stability … inverted-pour method → Impression is surrounded with a "box" made of wax and poured as one unit. 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. Impression materials Tubes Sticks/ carpules; h diagnostic models, custom trays, pre-treatment & post-treatment records; i 1. Cannot be…, The rate at which heat flows through material, the measurement of change in volume or length in relationship…, The ability to dissolve in another substance, Dental Materials Exam Lecture 6 Impression Materials, Impression materials are used to obtain an impression of teeth…, Impressions are a negative reproduction of dental structures​, preliminary, final, and occlusal, or also referred to as a (bi…, what will be constructed from the impression​, -Plaster... -Impression compound... -Waxes... -ZOE, Aqueous Hydrocolloids... -Agar... -Alginate... Non-aqueous elastomers…, Dental Materials - Chapter 8 - Impression Materials. A storage water bath, holds materials at 150˚ F 3. An agar impression material that can be heated to change a gel into a fluid sol state that can flow around the teeth, then cooled to gel again to make an impression of the shapes of the oral structures. Material for dental impressions. Allows the creation of a replica of the structures involved Border molding custom trays for denture impressions. General Comments – Impression materials are used to make replicas (models or casts) of t eeth and other oral tissues. Each type of material has different properties and characteristics. A silicone rubber impression that also sets by linking of molecules in long chains but produces no by-product. The most rigid of the elastic impression materials is, The least accurate of the elastic impression materials is. (i.e. A hard and brittle impression material used in complete denture procedures. Addition silicones are commoly known as polyvinyl siloxanes and are the most popular materials for crown and bridge procedures because of their accuracy, dimensional stability, and ease of use. Dental Plaster and Stone. Dental impression materials play a crucial role in your restorative dentistry practice. True False . Learn dental impression materials with free interactive flashcards. It kind of curves with the arch and is mostly seen in a plastic disposable tray. The components of the agar gels are 12% to 15% agar, 1% potassium sulfate to ensure proper set of the gypsum material poured in the impression, 0.2% borax as a strengthener for the gel, 0.1% alkyl benzoate as an antifungal during storage, and 85% water. Its greatest use today is for which procedure? D. Addition silicone. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Impression Materials A. Learn dental materials impressions with free interactive flashcards. Dental compound impression material can change from a solid to a soft material by heating it. B. The following statement is TRUE about the addition silicones. The materials offer features such as great detail reproduction, easy removal from the mouth and complete recovery from deformation. An impression material composed of resin and wax with fillers added to make it stronger and more stable than wax. Learn dental final impression materials with free interactive flashcards. The types of final impression materials commonly used in dental practice are polysulfide, polyether, condensation silicone, and addition silicone. anatomic portion → The structural portion of a dental model created from the alginate impression. 1. It then sets to become an elastic solid, … The chemistry and physical properties of dental plaster, stone, and high-strength stone are discussed later in this chapter. Contemporary dentistry generates new information every year and digital dentistry is becoming established and infl … Impression material is of liquid or semi-solid nature when first mixed and placed in the mouth. Impressions are used in the dental surgery to produce accurate (varying degrees of accuracy) negative reproductions of the patients’ teeth, surrounding tissues and dental arches. C. Does not affect the setting time. – In dentistry, we take impressions of teeth and their supporting structur es. This impression material is more flexible then its counterpart. The atoms are represented over six atomic planes, although dental structures have millions of atomic planes. The differences between impression materials, as outlined above, are the materials themselves and the purpose they are used for. True False . An impression material composed of a gypsum product similar to plaster of Paris. Allows the creation of a replica of the structures involved, Impression materials that is transformed from a sol to a gel state when set is, An example of an inelastic impression material, The types of impression materials that are considered hydrophilic are those that, Have good surface-wetting characteristics, Can be immersed in an appropriate disinifectant for up to 30 minutes without distorting, Cannot reverse from a gel to a sol because a chemical reaction prevents it, Polyvinyl impression materials are of the class known as. To ensure the best experience, please update your browser. Each of the materials has advantages and disadvantages, but they are each used for a different purpose and are effective and commonly used products in dentistry today. Different types of impression materials are available. )→ An advantage of reversible and irreversible colloids are: True False. s Which two impression materials harden upon cooling using a physical setting process? 13. Choose from 500 different sets of dental chapter 15 material flashcards on Quizlet. A dental impression is an imprint of teeth and/or soft tissues, formed with specific types of impression materials that is used in different area of dentistry including Prosthodontics. Oh no! Name two synonms for water based impression materials It lacks the accuracy and fine surface detail needed for impressions for crown and bridge procedures. Agar Why is it called reversible? A characteristic of gels to contract and squeeze out some liquid that then accumulates on the surface. 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