1.
Alginate impression material is:
A. 
Expensive compared to other impression materials
B. 
C. 
Not affected by gain or loss of water
D. 
Well known for its long-term stability
2.
Impression materials that have mechanical properties permitting considerable elastic deformation but that return to their original form are classified as:
A. 
B. 
C. 
D. 
3.
Dr Jones requested that you mix alginate and take an impression. While measuring the water, you got involved in conversation and did not notice how warm ir was. This oversight will:
A. 
B. 
Lengthen the gelation time
C. 
D. 
Shorten the gelation time
4.
Which of the following dental materials is an example of an aqueous elastometric?
A. 
B. 
C. 
D. 
Irreversible hydrocolloid
E. 
5.
The brown paste used in rubber base is called the:
A. 
B. 
C. 
D. 
6.
Dental impression compound is known as a/an
A. 
B. 
C. 
D. 
7.
The term used for the setting of hydrocolloid impression materials is
A. 
B. 
C. 
D. 
8.
The populatrity of agar impression material is limited by the:
A. 
B. 
Need for special equipment
C. 
Poor reproduction of detail
D. 
Difficulty in pouring the impression
9.
When an agar impression slightly contracts and exudes water, it is termed:
A. 
B. 
C. 
D. 
10.
Addition silicones are the most popular type of rubber impression materials. The reason for this is cost.
A. 
B. 
C. 
D. 
11.
Custom impression trays are made on a model of the patient's arch. Therefore, to make a custom tray, an alginate impression is also needed.
A. 
B. 
C. 
D. 
12.
Mrs Smith has not been to the dentist for several years. It was found that she needed extensive restorative treatment to which she agreed. You were asked to take impressions as the first step of her care. The impression material of choice would be:
A. 
B. 
C. 
Dental impression compound
D. 
13.
The impression tray that is used to record the prepared tooth, a bite registration, and an impression of the opposing teeth is a:
A. 
B. 
C. 
D. 
14.
Which of the following impression materials set by physcial means?
A. 
B. 
C. 
D. 
15.
The desirable strength of gympsum materials is ____ related to the amount of water used.
A. 
B. 
C. 
D. 
16.
For gypsum products, a suitable accelerator and retarder, respectively, would be:
A. 
Ethyl alcohol and oleic acid
B. 
C. 
Borax and potassium sulfate
D. 
Potassium sulfate and borax
17.
The gypsum material known as "high strength stone" may be also referred to as:
A. 
B. 
C. 
D. 
18.
The final setting time for gypsum products is typically:
A. 
B. 
C. 
D. 
19.
To make a correct mix for dental stone when using 50 g of powder, the amount of water would be approximately:
A. 
B. 
C. 
D. 
20.
Cathy and her parents will meet with an orthodontist to discuss an orthodontic treatment plan. At a previous appt, the orthodontist took impressions of Cathys maxillary and mandibular arches. The replicas made from each impression to discuss the treatment plan are termed:
A. 
B. 
C. 
D. 
21.
Decreasing the setting time of a dental material results in a products that:
A. 
B. 
C. 
Does not affect the setting time
D. 
22.
The weakest gypsum products is:
A. 
B. 
C. 
D. 
23.
When excess water is not present in a gypsum product, it is knwon as the:
A. 
B. 
C. 
D. 
24.
The best way to mix gypsum products is to:
A. 
"eyeball" the amount of powder added to water
B. 
C. 
D. 
Add powder and water to the bowl simultaneously
25.
Initial and final setting times of gypsum can be determined with the use of Gilmore Needles. A practical, wasy method to determine final setting time in a dental office would be to:
A. 
B. 
Ovserce the c hange from wet to dry strength
C. 
Watch for the loss of gloss
D. 
Attempt to penetrate the material with the metal spatula