Term | Definition |
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 its long-term stability | B. easy to use |
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 |
Dr. Jones requested that you mix alginate and take an impression. While measuring the water, you did not notice how warm it was. This oversight will:
A. make it unusable
B. lengthen gelation time
C. not affect gelation time
D. shorten gelation time | D. shorten the gelation time |
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 |
The brown paste used in rubber base is called the:
A. polymer
B. accelerator
C. base
D. filler | B. accelerator |
Dental impression compound is known as a/an:
A. chemoplastic material
B. irreversible material
C. hydroelastic material
D. thermoplastic material | D. thermoplastic material |
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 |
The term used for the setting of hydrocolloid impression materials is?
A. crystallization
B. polymerization
C. curing
D. gelation | D. gelation |
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 |
When agar impression slightly contracts and exudes water, it is termed:
A. imbibition
B. gelation
C. syneresis
D. hysteresis | C. syneresis |
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
D. false | A. true, false |
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
D. false | C. true |
Mrs. Smith has not been to the dentist for several years. It was found that she needed extensive restorative treatment. The impression material of choice would be:
A. agar
B. alginate
C. dental impression compound
D. addition silicone | B. alginate |
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 |
Which of the following impression materials set by physical means?
A. agar
B. ZOE
C. alginate
D. addition silicone | A. agar |