Question 1

Alginate impression material may be referred to as which type of material?

Accepted Answer

A)  Polyether 
B)  Addition silicone 
C)  Condensation silicone 
D)  Irreversible hydrocolloid 
E)  Reversible hydrocolloid 
A)  Polyether 
B)  Addition silicone 
C)  Condensation silicone 
D)  Irreversible hydrocolloid 
E)  Reversible hydrocolloid D

Question 2

At final seating, the incisal edges and cuspal tips should be ________ the surface of the tray.

Accepted Answer

A)  contacting 
B)  about 1 to 2 mm from 
C)  about 3 to 4 mm from 
D)  at least 6 mm from 
A)  contacting 
B)  about 1 to 2 mm from 
C)  about 3 to 4 mm from 
D)  at least 6 mm from B

Question 3

The ANSI-ADA specification requires no more than ____% permanent deformation when an alginate is compressed 20% for 5 seconds.

Accepted Answer

A)  2 
B)  5 
C)  25 
D)  50 
E)  95 
A)  2 
B)  5 
C)  25 
D)  50 
E)  95 B

Question 4

Alginate should be mixed by adding powder to water. Alginate should be mixed with a narrow, pliable spatula.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Question 5

What is an advantage of using an elastomeric impression material over an irreversible hydrocolloid?

Accepted Answer

A)  Less expensive 
B)  Reversible process 
C)  Greater dimensional accuracy 
D)  Best material for study models 
A)  Less expensive 
B)  Reversible process 
C)  Greater dimensional accuracy 
D)  Best material for study models

Question 6

Measurement of dimensional changes showed that immersion of alginate impressions for _________ did not affect their clinical accuracy.

Accepted Answer

A)  10 minutes 
B)  30 minutes 
C)  1 hour 
D)  5 days 
E)  2 weeks 
A)  10 minutes 
B)  30 minutes 
C)  1 hour 
D)  5 days 
E)  2 weeks

Question 7

What is/are the advantage(s) of using premeasured packets of alginate impression material?

Accepted Answer

A)  Impervious to moisture 
B)  Less expensive than cans 
C)  Premeasured for a full arch 
D)  All of the above 
E)  Only A and C 
A)  Impervious to moisture 
B)  Less expensive than cans 
C)  Premeasured for a full arch 
D)  All of the above 
E)  Only A and C

Question 8

What is the best method for delaying the setting of alginate?

Accepted Answer

A)  Increase the water temperature. 
B)  Reduce the water temperature. 
C)  Use a thinner mix of alginate. 
D)  Use a thicker mix of alginate. 
A)  Increase the water temperature. 
B)  Reduce the water temperature. 
C)  Use a thinner mix of alginate. 
D)  Use a thicker mix of alginate.

Question 9

Which of the following factors limit the accuracy of wax bite registrations?

Accepted Answer

A)  Distortion on removal 
B)  Release of internal stress on storage 
C)  Minimal dimensional changes from mouth to room temperature 
D)  A, B, and C 
E)  A and B 
A)  Distortion on removal 
B)  Release of internal stress on storage 
C)  Minimal dimensional changes from mouth to room temperature 
D)  A, B, and C 
E)  A and B

Question 10

How should a maxillary impression tray fit?

Accepted Answer

A)  Leave a 2-mm border around the alveolar process 
B)  Cover the distal of the most posterior tooth. 
C)  Include the maxillary tuberosity. 
D)  Extend past the mucobuccal fold. 
A)  Leave a 2-mm border around the alveolar process 
B)  Cover the distal of the most posterior tooth. 
C)  Include the maxillary tuberosity. 
D)  Extend past the mucobuccal fold.

Question 11

Higher rates of alginate deformation result in higher compressive and tear strengths. Alginate impressions are more likely to tear during removal from the mouth when they are removed rapidly.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Question 12

What is an accepted method for modifying an impression tray?

Accepted Answer

A)  Heating the tray to alter the configuration 
B)  Applying rope wax to the flanges 
C)  Adding compound to the edges 
D)  None of the above 
A)  Heating the tray to alter the configuration 
B)  Applying rope wax to the flanges 
C)  Adding compound to the edges 
D)  None of the above

Question 13

Which of the following are correct regarding silicone putties?

Accepted Answer

A)  May be mixed with bare hands 
B)  Should not be mixed with bare hands 
C)  Should not be mixed when latex rubber gloves are worn 
D)  A and C 
E)  B and C 
A)  May be mixed with bare hands 
B)  Should not be mixed with bare hands 
C)  Should not be mixed when latex rubber gloves are worn 
D)  A and C 
E)  B and C

Question 14

When is alginate hydrocolloid recommended?

Accepted Answer

A)  Preparation of study models 
B)  Impressions of cavity preparations 
C)  In the preparation of athletic mouth protectors 
D)  For A, B, and C 
E)  For A and C 
A)  Preparation of study models 
B)  Impressions of cavity preparations 
C)  In the preparation of athletic mouth protectors 
D)  For A, B, and C 
E)  For A and C

Question 15

Which of the following ingredients of alginate hydrocolloid reacts with dissolved alginate to form insoluble calcium alginate?

Accepted Answer

A)  Calcium sulfate 
B)  Potassium sulfate 
C)  Sodium phosphate 
D)  Sodium or potassium alginate salt 
A)  Calcium sulfate 
B)  Potassium sulfate 
C)  Sodium phosphate 
D)  Sodium or potassium alginate salt

Question 16

The dimensional change of polyethers is higher than that of the addition silicones. The polyether absorbs water and changes dimensions if stored in contact with water until equilibrium is reached.

Accepted Answer

A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect. 
A)  Statement 1 is correct; statement 2 is correct. 
B)  Statement 1 is correct; statement 2 is incorrect. 
C)  Statement 1 is incorrect; statement 2 is correct. 
D)  Statement 1 is incorrect; statement 2 is incorrect.

Question 17

Alginates, when properly mixed by hand, should develop a _________ consistency free of __________ in less than 1 minute for the normal set material and should be suitable for making impressions in the mouth.

Accepted Answer

A)  thixotropic; bubbles 
B)  thixotropic; graininess 
C)  smooth and creamy; bubbles 
D)  smooth and creamy; graininess 
A)  thixotropic; bubbles 
B)  thixotropic; graininess 
C)  smooth and creamy; bubbles 
D)  smooth and creamy; graininess

Question 18

Which solutions are used to disinfect an impression?

Accepted Answer

A)  Alcohol 
B)  Iodophor 
C)  Sodium hypochlorite 
D)  All of the above 
E)  Only B and C 
A)  Alcohol 
B)  Iodophor 
C)  Sodium hypochlorite 
D)  All of the above 
E)  Only B and C

Question 19

Why is it important to use vinyl gloves or bare hands to mix polyvinyl putty materials?

Accepted Answer

A)  Many patients are allergic to latex. 
B)  Latex gloves retard the setting of the material. 
C)  Latex gloves accelerate the setting of the material. 
D)  A and C are correct. 
E)  A and B are correct. 
A)  Many patients are allergic to latex. 
B)  Latex gloves retard the setting of the material. 
C)  Latex gloves accelerate the setting of the material. 
D)  A and C are correct. 
E)  A and B are correct.

Question 20

Sodium phosphate acts as a(n) ________ during the setting reaction of alginate hydrocolloid.

Accepted Answer

A)  initiator 
B)  retarder 
C)  sweetener 
D)  accelerator 
E)  disinfectant 
A)  initiator 
B)  retarder 
C)  sweetener 
D)  accelerator 
E)  disinfectant

Alginate impression material may be referred to as which type of material?

At final seating, the incisal edges and cuspal tips should be ________ the surface of the tray.

The ANSI-ADA specification requires no more than ____% permanent deformation when an alginate is compressed 20% for 5 seconds.

Alginate should be mixed by adding powder to water. Alginate should be mixed with a narrow, pliable spatula.

What is an advantage of using an elastomeric impression material over an irreversible hydrocolloid?

Measurement of dimensional changes showed that immersion of alginate impressions for _________ did not affect their clinical accuracy.

What is/are the advantage(s) of using premeasured packets of alginate impression material?

What is the best method for delaying the setting of alginate?

Which of the following factors limit the accuracy of wax bite registrations?

How should a maxillary impression tray fit?

Higher rates of alginate deformation result in higher compressive and tear strengths. Alginate impressions are more likely to tear during removal from the mouth when they are removed rapidly.

What is an accepted method for modifying an impression tray?

Which of the following are correct regarding silicone putties?

When is alginate hydrocolloid recommended?

Which of the following ingredients of alginate hydrocolloid reacts with dissolved alginate to form insoluble calcium alginate?

The dimensional change of polyethers is higher than that of the addition silicones. The polyether absorbs water and changes dimensions if stored in contact with water until equilibrium is reached.

Alginates, when properly mixed by hand, should develop a _ consistency free of __ in less than 1 minute for the normal set material and should be suitable for making impressions in the mouth.

Which solutions are used to disinfect an impression?

Why is it important to use vinyl gloves or bare hands to mix polyvinyl putty materials?

Sodium phosphate acts as a(n) ________ during the setting reaction of alginate hydrocolloid.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, Polishing, and Cleansing Materials

Cements

Model and Die Materials

Waxes

Casting Alloys, Wrought Alloys, and Solders

Casting, Soldering, and Welding

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Exam 8: Impression Materials

Alginate impression material may be referred to as which type of material?

At final seating, the incisal edges and cuspal tips should be ________ the surface of the tray.

The ANSI-ADA specification requires no more than ____% permanent deformation when an alginate is compressed 20% for 5 seconds.

Alginate should be mixed by adding powder to water. Alginate should be mixed with a narrow, pliable spatula.

What is an advantage of using an elastomeric impression material over an irreversible hydrocolloid?

Measurement of dimensional changes showed that immersion of alginate impressions for _________ did not affect their clinical accuracy.

What is/are the advantage(s) of using premeasured packets of alginate impression material?

What is the best method for delaying the setting of alginate?

Which of the following factors limit the accuracy of wax bite registrations?

How should a maxillary impression tray fit?

Higher rates of alginate deformation result in higher compressive and tear strengths. Alginate impressions are more likely to tear during removal from the mouth when they are removed rapidly.

What is an accepted method for modifying an impression tray?

Which of the following are correct regarding silicone putties?

When is alginate hydrocolloid recommended?

Which of the following ingredients of alginate hydrocolloid reacts with dissolved alginate to form insoluble calcium alginate?

The dimensional change of polyethers is higher than that of the addition silicones. The polyether absorbs water and changes dimensions if stored in contact with water until equilibrium is reached.

Alginates, when properly mixed by hand, should develop a _________ consistency free of __________ in less than 1 minute for the normal set material and should be suitable for making impressions in the mouth.

Which solutions are used to disinfect an impression?

Why is it important to use vinyl gloves or bare hands to mix polyvinyl putty materials?

Sodium phosphate acts as a(n) ________ during the setting reaction of alginate hydrocolloid.

Introduction to Restorative Dental Materials

Properties of Materials

Preventive Dental Materials

Direct Esthetic Restorative Materials

Dental Amalgam

Finishing, Polishing, and Cleansing Materials

Cements

Model and Die Materials

Waxes

Casting Alloys, Wrought Alloys, and Solders

Casting, Soldering, and Welding

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Alginates, when properly mixed by hand, should develop a _ consistency free of __ in less than 1 minute for the normal set material and should be suitable for making impressions in the mouth.