Question 1

A dentist might choose to use an addition silicone over a condensation silicone because:

Accepted Answer

A)   addition is stronger than condensation
B)   addition is cleaner to use
C)   addition does not distort as badly
D)   addition tastes betterE) A) and D)
F) A) and C) C

Question 2

Impressions should be disinfected:

Accepted Answer

A)   for an hour before pouring in gypsum
B)   at the dental lab check-in
C)   before rinsing with water
D)   at the chairside upon removalE) A) and B)
F) None of the above

Question 3

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)  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) A) and B)

Question 4

Mixed alginate should be loaded into the impression tray in _______ increments as ________ as possible.

Accepted Answer

A)   large; quickly
B)   large; slowly
C)   small; quickly
D)   small; slowlyE) C) and D)
F) B) and D)

Question 5

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies, a property called:

Accepted Answer

A)   agglutination
B)   hysteresis
C)   hydrophilic
D)   hydrophobicE) None of the above
F) A) and C) B

Question 6

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)  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) B) and C)
G) A) and B)

Question 7

Ideally, an alginate impression should be poured within:

Accepted Answer

A)   an hour
B)   a day
C)   a week
D)   a monthE) A) and D)
F) A) and B)

Question 8

List and describe the different types of impression materials suitable for crown and bridge procedures.

Accepted Answer

Polysulfide: An elastic impression mater...

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)  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 D)
G) C) and D) E

Question 10

_______ gloves should be used when mixing PVS putty.

Accepted Answer

A)   Utility
B)   Nitrile
C)   Latex
D)   VinylE) All of the above
F) A) and C)

Question 11

The completed impression forms a _____________ reproduction of the teeth and tissues, and the replica or model forms a _________ replica of the teeth and tissues.

Accepted Answer

A)   positive; positive
B)   positive; negative
C)   negative; positive
D)   negative; negativeE) B) and C)
F) A) and B)

Question 12

A properly extended maxillary alginate impression tray will extend posteriorly enough to include the:

Accepted Answer

A)   hamular notch
B)   retromolar pad
C)   soft palate
D)   uvulaE) A) and B)
F) A) and C)

Question 13

Which of the following is true of vinyl polyether silicone?

Accepted Answer

A)   It is hydrophobic.
B)   It can tolerate a little moisture around the preparation.
C)   It flows well but has low tear strength.
D)   It is available in three viscosities: light, monophase, and heavy.E) A) and B)
F) A) and D)

Question 14

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make dies for:

Accepted Answer

A)   direct composite inlays
B)   indirect composite inlays
C)   porcelain jacket crowns
D)   porcelain-fused-to-metal crownsE) None of the above
F) A) and D)

Question 15

For a maxillary alginate impression, the operator stands just ___________________ and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand.

Accepted Answer

A)   in front of the patient at the 5 o'clock position
B)   in front of the patient at the 7 o'clock position
C)   behind the patient at the 1 o'clock position
D)   behind the patient at the 11 o'clock positionE) B) and D)
F) A) and C)

Question 16

Which of the following is true of impression trays?

Accepted Answer

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

Question 17

Which of the following is true for hydrocolloids in dentistry?

Accepted Answer

A)   Agar hydrocolloid is a reversible hydrocolloid.
B)   When agar powder is mixed with water, it forms a glue-like suspension that entraps the water, making a colloidal suspension called a gel.
C)   The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts.
D)   Agar hydrocolloid requires the use of custom impression trays.E) C) and D)
F) A) and C)

Question 18

Casts made from improperly disinfected restorations:

Accepted Answer

A)   will not harbor microorganisms
B)   should be immersed in solution
C)   should be stored for 24 hours first
D)   cannot be disinfected, so start overE) A) and B)
F) B) and C)

Question 19

Alginate impressions are used routinely for all of the following except:

Accepted Answer

A)   mouth guard
B)   bleaching tray
C)   onlay
D)   retainerE) A) and D)
F) B) and D)

Question 20

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

Accepted Answer

A)   positive
B)   negative
C)   approximate
D)   distortedE) B) and D)
F) None of the above

Exam 14: Impression Materials

A dentist might choose to use an addition silicone over a condensation silicone because:

Correct AnswerverifiedC

Impressions should be disinfected:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Mixed alginate should be loaded into the impression tray in _______ increments as ________ as possible.

Correct AnswerverifiedShow Answer

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies, a property called:

Correct AnswerverifiedB

Match the items with the correct description below. -Hydrocolloid

Correct AnswerverifiedShow Answer

Ideally, an alginate impression should be poured within:

Correct AnswerverifiedShow Answer

List and describe the different types of impression materials suitable for crown and bridge procedures.

Correct AnswerverifiedPolysulfide: An elastic impression mater...View AnswerShow Answer

Match the items with the correct description below. -Alginate

Correct AnswerverifiedE

_______ gloves should be used when mixing PVS putty.

Correct AnswerverifiedShow Answer

The completed impression forms a _____________ reproduction of the teeth and tissues, and the replica or model forms a _________ replica of the teeth and tissues.

Correct AnswerverifiedShow Answer

A properly extended maxillary alginate impression tray will extend posteriorly enough to include the:

Correct AnswerverifiedShow Answer

Which of the following is true of vinyl polyether silicone?

Correct AnswerverifiedShow Answer

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make dies for:

Correct AnswerverifiedShow Answer

For a maxillary alginate impression, the operator stands just ___________________ and retracts the corner of the mouth with the side of the tray while retracting the other corner of the mouth with the index finger of the other hand.

Correct AnswerverifiedShow Answer

Which of the following is true of impression trays?

Correct AnswerverifiedShow Answer

Which of the following is true for hydrocolloids in dentistry?

Correct AnswerverifiedShow Answer

Casts made from improperly disinfected restorations:

Correct AnswerverifiedShow Answer

Alginate impressions are used routinely for all of the following except:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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C

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Mixed alginate should be loaded into the impression tray in _ increments as __ as possible.

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B

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Polysulfide: An elastic impression mater...
View Answer

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E

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The completed impression forms a _____ reproduction of the teeth and tissues, and the replica or model forms a _ replica of the teeth and tissues.

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