Final Review of Dental Impression Materials and Procedures 46 Quiz

Final review Question How is a stock impression tray prepared for an elastomeric impression? How is an alginate impression disinfected? Which of the following classifications of impression materials can also be referred to as (bite) registration? How should alginate material be loaded into a maxillary impression tray? Which instructions would be given to a patient obtaining a bite registration? What does the term syneresis mean as it relates to alginate impression? Alginate impressions must be poured within _____ so that distortion does not occur. Which of the following is utilized to extend the length or depth of the borders of an alginate impression tray? Which material is one of the most popular impression materials used for bite registration? Which type of impression tray covers the anterior portion of the dental arch? Which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material? What are the three classifications of impressions used in dentistry? Why would a dentist request preliminary impressions? What is the working time of normal-set alginate impression material? The shelf life of alginate material is approximately __ months. Which statement is correct regarding custom impression trays? How are alginate impressions removed from the mouth? What are preliminary impressions used to make? Which irreversible hydrocolloid material is used most widely for preliminary impressions? How are elastomeric impression materials mixed? What percent relative humidity is preferred for storing impressions? Which type of reversible hydrocolloid material is the most viscous? Which listed criteria would not be acceptable on an alginate impression? Which portion of the maxillary impression tray should be seated in the mouth first? Which impression material is used when an extremely accurate final impression is essential? Which material should be used if a more durable impression material is needed for bite registration? Which factor should be examined when evaluating the quality of an alginate impression? What type of impression tray is required with reversible hydrocolloid impressions? Which of the following is not correct regarding reversible hydrocolloids? 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. Which material is the most durable for occlusal bite registrations? Elastomeric materials use an Automix system. The extruder gun insert is a dual cartridge with a tube of catalyst and a tube of base. How will a water temperature of 80° F (26.6° C) affect an alginate mix? Which statement is an advantage of an Automix unit system for impressions? Impression trays are rigid for all of the following reasons except to What term is used when an alginate impression takes up water either from soaking or wrapping in a wet paper towel? What is the purpose of the calcium sulfate in impression alginate? Where should alginate and elastomer impressions be disinfected? Which of the four types of elastomeric materials has the best dimensional stability? Which type of impression is taken to produce a reproduction of the occlusal relationship of the maxilla and mandible teeth when in centric occlusion? What position should the EFDA use while taking mandibular and maxillary impressions? The retromolar area, lingual frenum, and mylohyoid ridge are reproduced in a mandibular impression. The tuberosity, labial frenum, tongue space, and incisive papilla are reproduced in a maxillary impression. Which type of elastomeric material has the highest viscosity? Why would utility wax be placed on the hard palate area of a maxillary impression tray? What are the three curing stages of impression materials? Answer Coated with adhesive Spray the alginate with an intermediate-level disinfectant. Occlusal Heavier in the anterior and labial areas Close normally and gently. Water evaporates from the impression. 1 hour Utility wax Polysiloxane Section Change the water temperature. Preliminary, final, and occlusal, or bite registration To fabricate custom trays 2 minutes 12 They can be constructed from resin. Use one quick, snap-out motion. Diagnostic models Provisional coverage Orthodontic appliances All of the above Alginate With a paper pad and spatula With an Automix system 100 Tray Void of frena and tuberosities Posterior Elastomeric Zinc oxide–eugenol (ZOE) The presence of the retromolar area and maxillary tuberosity are recorded. Anatomical detail is sharp and not distorted. Surfaces are free from voids. All of the above are factors. Water-cooled The material is 85% agar and 15% water. Neither statement is correct Zinc oxide–eugenol (ZOE) Both statements are correct. It will make the mix set faster. All of these are advantages. warp the completed impression Imbibition It reacts with potassium alginate to form the gel. Before leaving the treatment area Polysiloxane Bite registration Operator The first statement is correct; the second statement is incorrect. Putty To modify the impression tray to accommodate a high palatal vault Initial set, final set, final cure