Deck 19: Dental Materials Equipment

Question 1

Which of the following materials would NOT be mixed in a flexible rubber bowl?

A)Stone
B)Plaster
C)Die stone
D)Reversible hydrocolloid
E)Irreversible hydrocolloid

Answer 1

Reversible hydrocolloid

Question 2

The use of a water-cooled tray describes which impression technique?

A)Irreversible hydrocolloid
B)Reversible hydrocolloid
C)Polysulfide
D)Polyester

Answer 2

Reversible hydrocolloid

Question 3

How should an impression be cared for once it is removed from the mouth?

A)Sterilized
B)Disinfected
C)Submerged in a water bath
D)Rinsed off and poured immediately

Answer 3

Disinfected

Question 4

Bite registration trays come in a selection of right, left, and anterior.

Question 5

Which lab instrument is beneficial in separating an impression from the poured and set model?

A)Lab knife
B)Lab spatula
C)Model trimmer
D)Flexible metal spatula

Question 6

What is the purpose of a vacuum mixing unit?

A)Remove powder dust from the air as the material is mixed.
B)Remove excessive air from the material while mixing.
C)Mix gypsum materials to the proper consistency.
D)All of the above

Question 7

The automixer is used for which type of material?

A)Alginate (irreversible hydrocolloid)
B)Reversible hydrocolloid
C)Polyvinylsiloxane
D)None of the above.

Question 8

The flexible alginate spatula does not require sterilization following use.

Question 9

In the reversible hydrocolloid unit, what should the temperature for the storage bath be?

A)110° F (44° C)
B)150° F (65.5° C)
C)212° F (100° C)

Question 10

When would one use a triple tray for impressions?

A)To take a maxillary impression along with the occlusal bite.
B)To take a mandibular impression along with the occlusal bite.
C)To take a maxillary impression along with a mandibular impression.
D)To take a maxillary impression, mandibular impression, and an occlusal bite.
E)None of the above.

Question 11

Which of the following statements is incorrect about the use of a model trimmer?

A)Glasses must be worn when using a model trimmer.
B)Utility gloves must be worn when using a model trimmer.
C)A mask must be worn when using a model trimmer.
D)A splash guard must be in place on the model trimmer.

Question 12

In the reversible hydrocolloid unit, the temperature for the tempering bath should be

A)110° F (44° C).
B)150° F (65.5° C).
C)212° F (100° C).

Question 13

Which dental instrument is used to mix materials such as irreversible hydrocolloid and gypsum?

A)Flexible alginate spatula
B)Flexible rubber bowl
C)Mixing gun

Question 14

Why do impression trays have perforations?

A)Provides for easier clean-up after pouring.
B)Provide adequate air circulation for proper setting times.
C)Allow material to push through the holes, creating a mechanical lock that keeps the material in place.
D)All of the above are correct

Question 15

Flexible rubber bowls are used to mix which material(s)?

A)Powder and liquid, such as irreversible hydrocolloid (alginate)
B)Plaster or stone for pouring up models
C)Reversible hydrocolloid
D)Polyvinylsiloxane
E)A and B are both correct.

Question 16

An alginator is used in many dental procedures involving taking an alginate impression.