Question 1

When maxillary and mandibular models are trimmed and in occlusion, the overall height should be ____ inches.

Accepted Answer

A)   1.5
B)   2
C)   3
D)   It does not matter.

Question 2

Reversible hydrocolloid is maintained in the sol state if placed in a water storage bath of ____ degrees F.

Accepted Answer

A)   212
B)   150
C)   110
D)   55 B

Question 3

Undercuts are ____________.

Accepted Answer

A)   areas that have been overprepped by the handpiece
B)   areas that have been underprepped by the handpiece
C)   recessed areas that are wider on bottom than on the top
D)   none of the above

Question 4

Diagnostic casts can be trimmed in a geometric form that is pleasing in appearance.

Accepted Answer

A) True 
 B)False  True

Question 5

Which classification is utility wax?

Accepted Answer

A)   Pattern
B)   Processing
C)   Impression
D)   Study

Question 6

Silicone impression materials have all the advantages of polysulfides without the disadvantages.

Accepted Answer

A) True 
 B)False

Question 7

The tray used for alginate impressions is (are)  ____________.

Accepted Answer

A)   perforated
B)   rim locked
C)   either a or b
D)   neither a nor b

Question 8

Polymerization is the same as ____________.

Accepted Answer

A)   curing
B)   mixing
C)   trimming
D)   trying on in the patient's mouth

Question 9

Heating the raw gypsum in the manufacturing process is known as ____________.

Accepted Answer

A)   mining
B)   agitating
C)   calcination
D)   none of the above

Question 10

Both alginate and agar-agar are derived from ____________.

Accepted Answer

A)   limestone
B)   seaweed
C)   gelatin
D)   clay

Question 11

Another name for polysulfide impression material is ____________.

Accepted Answer

A)   rubber base
B)   silicone
C)   either a or b
D)   neither a nor b

Question 12

Alginate in the gel state is ____________.

Accepted Answer

A)   liquid
B)   solid
C)   gas
D)   alginate does not go into the sol state

Question 13

The removal of the alginate impression is done ____________.

Accepted Answer

A)   slowly
B)   with a twisting motion
C)   with a rocking motion
D)   with a quick snap

Question 14

What is placed on the model during construction to allow room in the tray for the impression material?

Accepted Answer

A)   Stops
B)   Spacer
C)   Handle
D)   None of the above

Question 15

Type III gypsum is used for ____________.

Accepted Answer

A)   study models
B)   working models
C)   dies
D)   mounting casts on an articulator

Question 16

Silicone-based impression materials are an alternative to alginate materials.

Accepted Answer

A) True 
 B)False

Question 17

It is very unlikely for cross-contamination of impression materials to occur between the treatment room and the laboratory.

Accepted Answer

A) True 
 B)False

Question 18

The ratio of water to powder for stone is ____ ml to 100 g.

Accepted Answer

A)   24
B)   30
C)   50
D)   60

Question 19

Polyether is supplied in ____________.

Accepted Answer

A)   powder or liquid form
B)   two-paste form
C)   single light-cured paste form
D)   putty or wash form

Question 20

Custom trays are (can)  be made from ____________.

Accepted Answer

A)   thermoplastic material
B)   vacuum resin
C)   acrylic resin
D)   all of the above D

Exam 39: Laboratory Materials and Techniques

When maxillary and mandibular models are trimmed and in occlusion, the overall height should be ____ inches.

Correct AnswerverifiedShow Answer

Reversible hydrocolloid is maintained in the sol state if placed in a water storage bath of ____ degrees F.

Correct AnswerverifiedB

Undercuts are ____________.

Correct AnswerverifiedShow Answer

Diagnostic casts can be trimmed in a geometric form that is pleasing in appearance.

Correct AnswerverifiedTrue

Which classification is utility wax?

Correct AnswerverifiedShow Answer

Silicone impression materials have all the advantages of polysulfides without the disadvantages.

Correct AnswerverifiedShow Answer

The tray used for alginate impressions is (are) ____________.

Correct AnswerverifiedShow Answer

Polymerization is the same as ____________.

Correct AnswerverifiedShow Answer

Heating the raw gypsum in the manufacturing process is known as ____________.

Correct AnswerverifiedShow Answer

Both alginate and agar-agar are derived from ____________.

Correct AnswerverifiedShow Answer

Another name for polysulfide impression material is ____________.

Correct AnswerverifiedShow Answer

Alginate in the gel state is ____________.

Correct AnswerverifiedShow Answer

The removal of the alginate impression is done ____________.

Correct AnswerverifiedShow Answer

What is placed on the model during construction to allow room in the tray for the impression material?

Correct AnswerverifiedShow Answer

Type III gypsum is used for ____________.

Correct AnswerverifiedShow Answer

Silicone-based impression materials are an alternative to alginate materials.

Correct AnswerverifiedShow Answer

It is very unlikely for cross-contamination of impression materials to occur between the treatment room and the laboratory.

Correct AnswerverifiedShow Answer

The ratio of water to powder for stone is ____ ml to 100 g.

Correct AnswerverifiedShow Answer

Polyether is supplied in ____________.

Correct AnswerverifiedShow Answer

Custom trays are (can) be made from ____________.

Correct AnswerverifiedD

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B

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True

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D