Help
Options
Question
How is a stock impression tray prepared for an elastomeric impression?
click to flip
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't know
Question
How is an alginate impression disinfected?
Remaining cards (44)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
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