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Chapter 46 Quiz
Final review
| Question | Answer |
|---|---|
| How is a stock impression tray prepared for an elastomeric impression? | Coated with adhesive |
| How is an alginate impression disinfected? | Spray the alginate with an intermediate-level disinfectant. |
| Which of the following classifications of impression materials can also be referred to as (bite) registration? | Occlusal |
| How should alginate material be loaded into a maxillary impression tray? | Heavier in the anterior and labial areas |
| Which instructions would be given to a patient obtaining a bite registration? | Close normally and gently. |
| What does the term syneresis mean as it relates to alginate impression? | Water evaporates from the impression. |
| Alginate impressions must be poured within _____ so that distortion does not occur. | 1 hour |
| Which of the following is utilized to extend the length or depth of the borders of an alginate impression tray? | Utility wax |
| Which material is one of the most popular impression materials used for bite registration? | Polysiloxane |
| Which type of impression tray covers the anterior portion of the dental arch? | Section |
| Which of the following is an acceptable method for altering the setting time of alginate irreversible hydrocolloid impression material? | Change the water temperature. |
| What are the three classifications of impressions used in dentistry? | Preliminary, final, and occlusal, or bite registration |
| Why would a dentist request preliminary impressions? | To fabricate custom trays |
| What is the working time of normal-set alginate impression material? | 2 minutes |
| The shelf life of alginate material is approximately __ months. | 12 |
| Which statement is correct regarding custom impression trays? | They can be constructed from resin. |
| How are alginate impressions removed from the mouth? | Use one quick, snap-out motion. |
| What are preliminary impressions used to make? | Diagnostic models Provisional coverage Orthodontic appliances All of the above |
| Which irreversible hydrocolloid material is used most widely for preliminary impressions? | Alginate |
| How are elastomeric impression materials mixed? | With a paper pad and spatula With an Automix system |
| What percent relative humidity is preferred for storing impressions? | 100 |
| Which type of reversible hydrocolloid material is the most viscous? | Tray |
| Which listed criteria would not be acceptable on an alginate impression? | Void of frena and tuberosities |
| Which portion of the maxillary impression tray should be seated in the mouth first? | Posterior |
| Which impression material is used when an extremely accurate final impression is essential? | Elastomeric |
| Which material should be used if a more durable impression material is needed for bite registration? | Zinc oxide–eugenol (ZOE) |
| Which factor should be examined when evaluating the quality of an alginate impression? | 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. |
| What type of impression tray is required with reversible hydrocolloid impressions? | Water-cooled |
| Which of the following is not correct regarding reversible hydrocolloids? | The material is 85% agar and 15% water. |
| 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 |
| Which material is the most durable for occlusal bite registrations? | Zinc oxide–eugenol (ZOE) |
| Elastomeric materials use an Automix system. The extruder gun insert is a dual cartridge with a tube of catalyst and a tube of base. | Both statements are correct. |
| How will a water temperature of 80° F (26.6° C) affect an alginate mix? | It will make the mix set faster. |
| Which statement is an advantage of an Automix unit system for impressions? | All of these are advantages. |
| Impression trays are rigid for all of the following reasons except to | warp the completed impression |
| What term is used when an alginate impression takes up water either from soaking or wrapping in a wet paper towel? | Imbibition |
| What is the purpose of the calcium sulfate in impression alginate? | It reacts with potassium alginate to form the gel. |
| Where should alginate and elastomer impressions be disinfected? | Before leaving the treatment area |
| Which of the four types of elastomeric materials has the best dimensional stability? | Polysiloxane |
| Which type of impression is taken to produce a reproduction of the occlusal relationship of the maxilla and mandible teeth when in centric occlusion? | Bite registration |
| What position should the EFDA use while taking mandibular and maxillary impressions? | Operator |
| 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. | The first statement is correct; the second statement is incorrect. |
| Which type of elastomeric material has the highest viscosity? | Putty |
| Why would utility wax be placed on the hard palate area of a maxillary impression tray? | To modify the impression tray to accommodate a high palatal vault |
| What are the three curing stages of impression materials? | Initial set, final set, final cure |
Created by:
alejac0360