Question 1

Which of the following elastomers is the most hydrophilic?

Accepted Answer

A)   Polysulfides
B)   Polyethers
C)   Condensation silicones
D)   Addition siliconesE) A) and D)
F) A) and C)

Question 2

Match the items with the correct description below.
-Reversible hydrocolloid

Accepted Answer

A)  An alginate impression material that is mixed to a sol state and as it sets converts to a gel by a chemical reaction that irreversibly changes its nature
B)  Glue-like material composed of two or more substances in which one substance does not go into solution but is suspended within another substance
C)  An agar impression material that can be heated to change from a gel into a fluid state that can flow around the teeth
D)  A water-based colloid used as an elastic impression material
E)  A versatile irreversible hydrocolloid that is the most used impression material in the dental officeF) None of the above
G) All of the above

Question 3

Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials?

Accepted Answer

A)   Polyether
B)   Polysulfide
C)   Addition silicone
D)   Condensation siliconeE) C) and D)
F) A) and B)

Question 4

Containers of alginate such as cans or plastic containers should be turned end-over-end a few times to decompress the powder and mix the ingredients. Alginate dust is potentially hazardous to inhale because it contains silicon dioxide in the diatomaceous earth fillers.

Accepted Answer

A)   Both statements are true.
B)   Both statements are false.
C)   The first statement is true, the second statement is false.
D)   The first statement is false, the second statement is true.E) C) and D)
F) B) and C)

Question 5

Match the items with the correct description below.
-Colloid

Accepted Answer

A)  An alginate impression material that is mixed to a sol state and as it sets converts to a gel by a chemical reaction that irreversibly changes its nature
B)  Glue-like material composed of two or more substances in which one substance does not go into solution but is suspended within another substance
C)  An agar impression material that can be heated to change from a gel into a fluid state that can flow around the teeth
D)  A water-based colloid used as an elastic impression material
E)  A versatile irreversible hydrocolloid that is the most used impression material in the dental officeF) A) and E)
G) None of the above

Question 6

When an impression tray is chosen, it should:

Accepted Answer

A)   be large enough to fit all oral structures
B)   be rigid to support the impression material
C)   accurately reproduce vestibules
D)   All of the above are considered.E) None of the above
F) A) and B)

Question 7

Which of the following is true for alginate hydrocolloid?

Accepted Answer

A)   Fast-set alginate has a working time of 2 to 3 minutes.
B)   Adjusting the powder-to-water ratio is the best way to lengthen or shorten the setting time.
C)   Alginate hydrocolloid should be removed slowly to prevent deformation of critical surfaces.
D)   Some moisture will be lost from the impression even in 100% humidity.E) B) and C)
F) A) and C)

Question 8

When mixing alginate, as the water temperature increases, the working time:

Accepted Answer

A)   increases
B)   decreases
C)   stays the sameD) None of the above
E) All of the above

Question 9

Which of the following is an elastic impression material?

Accepted Answer

A)   Dental impression compound
B)   Impression plaster
C)   Impression wax
D)   Vinyl polyether siliconeE) B) and C)
F) B) and D)

Question 10

A vast majority of dies are made from:

Accepted Answer

A)   epoxy
B)   metal
C)   gypsum
D)   waxE) A) and B)
F) B) and D)

Question 11

When preparing to take an alginate impression, which of the following is not necessary?

Accepted Answer

A)   Fluff the material to mix.
B)   Wear a mask and eyewear.
C)   Have patient use antibacterial rinse.
D)   Use a try-in tray for fit.E) B) and D)
F) A) and C)

Question 12

Impressions taken with polyether should be poured within:

Accepted Answer

A)   30 minutes
B)   1 hour
C)   1 day
D)   1 weekE) A) and C)
F) A) and B)

Question 13

Which of the following is the most widely used dental impression material?

Accepted Answer

A)   Reversible hydrocolloid
B)   Irreversible hydrocolloid
C)   Addition silicone impression material
D)   Condensation silicone impression materialE) A) and B)
F) None of the above

Question 14

Impressions taken with polyvinyl siloxane should be poured within:

Accepted Answer

A)   30 minutes
B)   1 hour
C)   1 day
D)   1 weekE) A) and B)
F) A) and C)

Exam 14: Impression Materials

Impressions taken with polyvinyl siloxane should be poured within:

Correct Answer
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Match the items with the correct description below. -Reversible hydrocolloid

Correct Answer
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Impressions taken with polyether should be poured within:

Correct Answer
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When preparing to take an alginate impression, which of the following is not necessary?

Correct Answer
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When an impression tray is chosen, it should:

Correct Answer
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Which of the following is true for alginate hydrocolloid?

Correct Answer
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A vast majority of dies are made from:

Correct Answer
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Match the items with the correct description below. -Colloid

Correct Answer
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When mixing alginate, as the water temperature increases, the working time:

Correct Answer
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Which of the following is an elastic impression material?

Correct Answer
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Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials?

Correct Answer
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Containers of alginate such as cans or plastic containers should be turned end-over-end a few times to decompress the powder and mix the ingredients. Alginate dust is potentially hazardous to inhale because it contains silicon dioxide in the diatomaceous earth fillers.

Correct Answer
verified

Which of the following is the most widely used dental impression material?

Correct Answer
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Which of the following elastomers is the most hydrophilic?

Correct Answer
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Exam 14: Impression Materials

Impressions taken with polyvinyl siloxane should be poured within:

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Reversible hydrocolloid

Correct AnswerverifiedShow Answer

Impressions taken with polyether should be poured within:

Correct AnswerverifiedShow Answer

When preparing to take an alginate impression, which of the following is not necessary?

Correct AnswerverifiedShow Answer

When an impression tray is chosen, it should:

Correct AnswerverifiedShow Answer

Which of the following is true for alginate hydrocolloid?

Correct AnswerverifiedShow Answer

A vast majority of dies are made from:

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Colloid

Correct AnswerverifiedShow Answer

When mixing alginate, as the water temperature increases, the working time:

Correct AnswerverifiedShow Answer

Which of the following is an elastic impression material?

Correct AnswerverifiedShow Answer

Which of the following impression materials has the smallest dimensional change on setting of all elastomeric and hydrocolloid impression materials?

Correct AnswerverifiedShow Answer

Containers of alginate such as cans or plastic containers should be turned end-over-end a few times to decompress the powder and mix the ingredients. Alginate dust is potentially hazardous to inhale because it contains silicon dioxide in the diatomaceous earth fillers.

Correct AnswerverifiedShow Answer

Which of the following is the most widely used dental impression material?

Correct AnswerverifiedShow Answer

Which of the following elastomers is the most hydrophilic?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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