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DEN120 Ch46

QuestionAnswer
Which type of elastomeric material has the highest viscosity? Putty
Which of the following is not correct regarding reversible hydrocolloids? The material is 85% agar and 15% water.
What percent relative humidity is preferred for storing impressions? 100
How are alginate impressions removed from the mouth? Use one quick, snap-out motion.
Why would a dentist request preliminary impressions? To fabricate custom trays
Which of the four types of elastomeric materials has the best dimensional stability? Polysiloxane
An impression is a positive reproduction of teeth and surrounding oral tissues. The model created from the impression is a negative reproduction of the structures. Neither statement is correct.
What is the working time of normal-set alginate impression material? 2 minutes
How are elastomeric impression materials mixed? With a paper pad and spatula and With an Automix system
Which material is the most durable for occlusal bite registrations? Zinc oxide–eugenol (ZOE)
What are the three curing stages of impression materials? Initial set, final set, final cure
Which statement is correct regarding custom impression trays? They can be constructed from resin.
The shelf life of alginate material is approximately __ months. 12
What is the purpose of the calcium sulfate in impression alginate? It reacts with potassium alginate to form the gel.
Which impression material is used when an extremely accurate final impression is essential? Elastomeric
Which material is one of the most popular impression materials used for bite registration? Polysiloxane
Which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material? Change the water temperature.
What position should the EFDA use while taking mandibular and maxillary impressions? Operator
What type of impression tray is required with reversible hydrocolloid impressions? Water-cooled
Created by: Maljac
 

 



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