Question 1

Of the items listed,which would not be made from an alginate impression?

Accepted Answer

A)   Mouth guard
B)   Bleaching tray
C)   Retainer
D)   OnlayE) A) and C)
F) B) and D)

Question 2

_____ 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 B)

Question 3

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

Accepted Answer

A)   Reversible hydrocolloid
B)   Irreversible hydrocolloid
C)   Addition of silicone impression material
D)   Condensation silicone impression materialE) All of the above
F) B) and C)

Question 4

When using elastomers,which of the following should be blocked out with utility wax to prevent the impression material from locking under them and preventing removal of the impression tray?
1) Undercuts around bridge pontics
2) Open embrasures around periodontally involved teeth
3) Fixed implant fixtures
4) Hamular notch

Accepted Answer

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

Question 5

What is the ideal time frame for pouring an alginate impression?

Accepted Answer

A)   An hour
B)   A day
C)   A week
D)   A monthE) None of the above
F) B) and C)

Question 6

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

Question 7

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)  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 E)
G) B) and E)

Question 8

For a maxillary alginate impression,the operator stands just _____ the patient at the _____ o'clock position 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;5
B)   in front of;7
C)   behind;1
D)   behind;11E) All of the above
F) B) and C)

Question 9

Which of the following is an elastic impression material?

Accepted Answer

A)   Impression wax
B)   Impression plaster
C)   Vinyl polyether silicone
D)   Dental impression compoundE) None of the above
F) All of the above

Question 10

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 D)
F) A) and C)

Question 11

Which statement is correct regarding alginate hydrocolloid?

Accepted Answer

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

Question 12

Which of the following is true for hydrocolloids in dentistry?

Accepted Answer

A)   Agar hydrocolloid is a reversible hydrocolloid.
B)   Agar hydrocolloid requires the use of custom impression trays.
C)   The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts.
D)   When agar powder is mixed with water,it forms a gluelike suspension that entraps the water,making a colloidal suspension called a gel.E) A) and D)
F) None of the above A

Question 13

What could occur if a cast is made from an improperly disinfected impression?

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) C) and D)
F) A) and B) C

Question 14

What is occurring when an alginate impression appears to sweat,showing droplets on the surface?

Accepted Answer

A)   Syneresis
B)   Hysteresis
C)   Imbibition
D)   DehydrationE) B) and D)
F) A) and C)

Question 15

Which characteristic should be considered when choosing an impression tray?

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 C) D

Question 16

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make which types of dies?

Accepted Answer

A)   Direct composite inlays
B)   Indirect composite inlays
C)   Porcelain jacket crowns
D)   Porcelain-fused-to-metal crownsE) A) and C)
F) B) and C)

Question 17

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

Accepted Answer

•Polysulfide: An elastic impression mate...

Question 18

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) A) and D)
F) A) and C)

Question 19

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies.What is this property called?

Accepted Answer

A)   Hysteresis
B)   Hydrophilic
C)   Hydrophobic
D)   AgglutinationE) None of the above
F) B) and C)

Question 20

When should impressions be disinfected?

Accepted Answer

A)   At the dental lab check-in
B)   Before rinsing with water
C)   At the chairside upon removal
D)   For an hour before pouring in gypsumE) C) and D)
F) All of the above

Exam 15: Impression Materials

Of the items listed,which would not be made from an alginate impression?

Correct Answer
verified

_____ gloves should be used when mixing PVS putty.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

What is the ideal time frame for pouring an alginate impression?

Correct Answer
verified

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

Correct Answer
verified

Match the items with the correct description below. -Colloid

Correct Answer
verified

For a maxillary alginate impression,the operator stands just _ the patient at the _ o'clock position 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 Answer
verified

Which of the following is an elastic impression material?

Correct Answer
verified

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 Answer
verified

Which statement is correct regarding alginate hydrocolloid?

Correct Answer
verified

Which of the following is true for hydrocolloids in dentistry?

Correct Answer
verified
A

What could occur if a cast is made from an improperly disinfected impression?

Correct Answer
verified
C

What is occurring when an alginate impression appears to sweat,showing droplets on the surface?

Correct Answer
verified

Which characteristic should be considered when choosing an impression tray?

Correct Answer
verified
D

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make which types of dies?

Correct Answer
verified

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

Correct Answer
verified
•Polysulfide: An elastic impression mate...
View Answer

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

Correct Answer
verified

The temperature at which the hydrocolloid liquefies is not the same temperature at which it solidifies.What is this property called?

Correct Answer
verified

When should impressions be disinfected?

Correct Answer
verified

Exam 15: Impression Materials

Of the items listed,which would not be made from an alginate impression?

Correct AnswerverifiedShow Answer

_____ gloves should be used when mixing PVS putty.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the ideal time frame for pouring an alginate impression?

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

Match the items with the correct description below. -Colloid

Correct AnswerverifiedShow Answer

For a maxillary alginate impression,the operator stands just _____ the patient at the _____ o'clock position 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 an elastic impression material?

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

Which statement is correct regarding alginate hydrocolloid?

Correct AnswerverifiedShow Answer

Which of the following is true for hydrocolloids in dentistry?

Correct AnswerverifiedA

What could occur if a cast is made from an improperly disinfected impression?

Correct AnswerverifiedC

What is occurring when an alginate impression appears to sweat,showing droplets on the surface?

Correct AnswerverifiedShow Answer

Which characteristic should be considered when choosing an impression tray?

Correct AnswerverifiedD

Some practitioners use a specially formulated addition silicone material in an automatic mixing cartridge system to make which types of dies?

Correct AnswerverifiedShow Answer

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

Correct Answerverified•Polysulfide: An elastic impression mate...View AnswerShow 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.What is this property called?

Correct AnswerverifiedShow Answer

When should impressions be disinfected?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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For a maxillary alginate impression,the operator stands just _ the patient at the _ o'clock position 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 Answer
verified

Correct Answer
verified

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 Answer
verified

Correct Answer
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Correct Answer
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A

Correct Answer
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C

Correct Answer
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Correct Answer
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D

Correct Answer
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Correct Answer
verified
•Polysulfide: An elastic impression mate...
View Answer

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified