What criteria need to be considered for choosing the correct impression tray?ĭeep enough to provide 2 mm of space for alginate beyond the incisal edge and occlusal surface and it should extend into the facial and lingual vestibules without impinging the tissues When removing an alginate impression from the mouth, what can be done to prevent deformation? What is the best way to shorten the setting time of alginate? Which types of impressions are used when a crown is done on a tooth?īoth preliminary and final impressions as well as a bite registration Polysulfides, condensation silicones, addition silicones, polyvinyl siloxane, and polyether Highly accurate elastic impression material that have qualities similar to rubber What is an example of an irreversible hydrocolloid?Īn impression that when heated can go back to its original state Stock metal trays with tubing running through them that connects to a water line by rubber hoses What type of impression material is agar?Īfter agar is mixed, what is the colloidal suspension called? It is a stock sectional tray that is used to make an impression of the teeth being treated and the opposing teeth at the same time They are constructed in the laboratory with chemically cured, light-cured, or thermoplastic resins on casts of the teeth What is an advantage of metal impression trays? What are advantages of plastic impression trays? Is the completed impression a positive or negative reproduction of the teeth and tissues? Is the completed replica or model a positive or negative reproduction of the teeth and tissues? Dental Materials Impressions Ch 15 Question
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