Dental Materials Ch. 8 Flashcards Preview

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Flashcards in Dental Materials Ch. 8 Deck (15)
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1

Alginate impression material is:

a) Expensive compared with other impression materials
b) easy to use
c) Not affected by gain or loss of water
d) well known for it's long-term stability

b) easy to use

2

Impression materials that have mechanical properties permitting considerable elastic deformation but that return to their original form are classified as:

a) thermoplastic
b) elastomeric
c) inelastic
d) resins

b) elastomeric

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 it was. This oversight will:

a) make the mix unusable
b) lengthen the gelation time
c) Not affect the gelation time
d) Shorten the gelation time

d) Shorten the gelation time

4

Which of the following dental materials is an example of an aqueous elastomeric?

a) Impression compound
b) ZOE impression paste
c) Polysulfide
d) irreversible hydrocolloid
e) Addition silicone

d) irreversible hydrocolloid

5

the brown paste used in rubber base is called the:

a) polymer
b) accelerator
c) base
d) filler

b) accelerator

6

Dental impression compound is known as a/an ___________.

a)chemoplastic material
b) irreversible material
c) Hydroelastic material
d) Thermoplastic material

d) Thermoplastic material

7

which of the following is an example of an inelastic impression material?

a) Polysulfide
b) ZOE impression paste
c) Alginate
d) Addition silicone

b) ZOE impression paste

8

The term used for the setting of hydrocolloid impression materials is:

a) Crystallization
b) Polymerization
c) Curing
d) Gelation

d) Gelation

9

the popularity of agar impression material is limited by the:

a) high cost
b) need for special equipment
c) poor reproduction of detail
d) difficulty in pouring the impression

b) need for special equipment

10

When an agar impression slightly contracts and exudes water, it is termed:

a) imbibition
b) Gelation
c) Syneresis
d) Hysteresis

c) Syneresis

11

Addition silicones are the most popular type of rubber impression materials. The reason for this is cost.

a) true/false
b) false/true
c) true/true
d) false/false

a) true/false

12

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) true/false
b)false/true
c) true/true
d) false/false

c) true/true

13

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) agar
b) alginate
c) dental impression compound
d) addition silicone

b) alginate

14

The impression tray that is used to record the prepared tooth, a bite registration, and an impression of the opposing teeth is a:

a) stock tray
b) custom tray
c) triple tray
d) bite registration tray

c) triple tray

15

which of the following impression materials set by physical means?

a) Agar
b) ZOE
c) alginate
d) addition silicone

a) Agar