Question 1

A properly extended maxillary alginate impression tray will extend posteriorly enough to include which oral landmark?

Accepted Answer

A)   Retromolar pad
B)   Hamular notch
C)   Soft palate
D)   UvulaE) B) and C)
F) C) and D)

Question 2

Which statement is true about impression trays?

Accepted Answer

A)   The triple tray is a custom full-arch tray used for bite registration.
B)   Stock trays are made of plastic rather than metal and can be solid or perforated.
C)   Plastic trays are inexpensive and disposable,whereas metal trays are more expensive and must be cleaned and sterilized between uses.
D)   Custom trays are constructed in the patient's mouth with chemically cured,light-cured,or thermoplastic resins on casts of the teeth.E) B) and C)
F) A) and B)

Question 3

Which of the following disinfectants are compatible with addition silicone impression materials?
1) 1:10 sodium hypochlorite
2) 1:213 iodophors
3) Glutaraldehydes
4) Complex phenolics

Accepted Answer

A)   1,2,3,4
B)   1,2,3
C)   2,3,4
D)   2,3E) A) and B)
F) A) and C)

Question 4

A dental impression is a/an _____ reproduction of the teeth.

Accepted Answer

A)   positive
B)   negative
C)   distorted
D)   approximateE) A) and C)
F) A) and B)

Question 5

Impressions taken with polyvinyl siloxane should be poured within:

Accepted Answer

A)   30 minutes.
B)   1 hour.
C)   1 day.
D)   1 week.E) A) and C)
F) A) and B)

Question 6

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)  Gluelike 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) B) and C)
G) B) and D)

Question 7

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) C) and D)
F) All of the above

Question 8

Impressions taken with polyether should be poured within what time period?

Accepted Answer

A)   30 minutes
B)   1 hour
C)   1 day
D)   1 weekE) All of the above
F) None of the above

Question 9

Match the items with the correct description below.
-Alginate

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)  Gluelike 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 B)
G) B) and D)

Question 10

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) A) and D)
F) All of the above

Question 11

Why would a dentist choose to use an addition silicone over a condensation silicone?

Accepted Answer

A)   Addition is stronger than condensation.
B)   Addition does not distort as badly.
C)   Addition is cleaner to use.
D)   Addition tastes better.E) A) and C)
F) A) and B)

Question 12

Match the items with the correct description below.
-Irreversible 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)  Gluelike 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 B)
G) A) and C)

Question 13

Which of the following is true of vinyl polyether silicone?

Accepted Answer

A)   It is hydrophobic.
B)   It flows well but has low tear strength.
C)   It can tolerate a little moisture around the preparation.
D)   It is available in three viscosities: light,monophase,and heavy.E) A) and B)
F) None of the above

Question 14

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

Accepted Answer

A)   increases.
B)   decreases.
C)   stays the same.D) All of the above
E) A) and B)

Question 15

Which of the following elastomers are the most hydrophilic?

Accepted Answer

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

Question 16

Match the items with the correct description below.
-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)  Gluelike 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 B)
G) C) and D)

Exam 15: Impression Materials

A dental impression is a/an _____ reproduction of the teeth.

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

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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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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Which of the following is true of vinyl polyether silicone?

Correct Answer
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Which of the following disinfectants are compatible with addition silicone impression materials? 1) 1:10 sodium hypochlorite 2) 1:213 iodophors 3) Glutaraldehydes 4) Complex phenolics

Correct Answer
verified

Impressions taken with polyether should be poured within what time period?

Correct Answer
verified

A properly extended maxillary alginate impression tray will extend posteriorly enough to include which oral landmark?

Correct Answer
verified

Which statement is true about impression trays?

Correct Answer
verified

Why would a dentist choose to use an addition silicone over a condensation silicone?

Correct Answer
verified

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

Correct Answer
verified

Match the items with the correct description below. -Alginate

Correct Answer
verified

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

Match the items with the correct description below. -Hydrocolloid

Correct Answer
verified

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

Correct Answer
verified

Exam 15: Impression Materials

A dental impression is a/an _____ reproduction of the teeth.

Correct AnswerverifiedShow Answer

Which of the following elastomers are the most hydrophilic?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Which of the following is true of vinyl polyether silicone?

Correct AnswerverifiedShow Answer

Which of the following disinfectants are compatible with addition silicone impression materials? 1) 1:10 sodium hypochlorite 2) 1:213 iodophors 3) Glutaraldehydes 4) Complex phenolics

Correct AnswerverifiedShow Answer

Impressions taken with polyether should be poured within what time period?

Correct AnswerverifiedShow Answer

A properly extended maxillary alginate impression tray will extend posteriorly enough to include which oral landmark?

Correct AnswerverifiedShow Answer

Which statement is true about impression trays?

Correct AnswerverifiedShow Answer

Why would a dentist choose to use an addition silicone over a condensation silicone?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Match the items with the correct description below. -Alginate

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

Match the items with the correct description below. -Hydrocolloid

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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