Question 1

What are the recommendations for mixing alginate?

Accepted Answer

A)  Using ice water 
B)  Adding the powder to the water 
C)  Adding the water to the powder 
D)  Both A and B 
E)  Both A and C 
A)  Using ice water 
B)  Adding the powder to the water 
C)  Adding the water to the powder 
D)  Both A and B 
E)  Both A and C

Question 2

Impression materials can be classified as those that are flexible and those that are rigid at the time of removal from the mouth. A rigid impression material is restricted to applications in areas where undercuts exist.

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 3

Which of the following is correct regarding addition silicone?

Accepted Answer

A)  Hydrophylic 
B)  Hydrophobic 
C)  High viscosity 
D)  Low dimensional change 
A)  Hydrophylic 
B)  Hydrophobic 
C)  High viscosity 
D)  Low dimensional change

Question 4

Of the following, which will alter setting times for alginates?

Accepted Answer

A)  Decreased water temperature 
B)  Increased water temperature 
C)  Decreased powder 
D)  A, B, and C 
E)  Only A and B 
A)  Decreased water temperature 
B)  Increased water temperature 
C)  Decreased powder 
D)  A, B, and C 
E)  Only A and B

Question 5

Bubbles are produced in gypsum dies if poured within which time period?

Accepted Answer

A)  Less than 1 hour 
B)  1 hour 
C)  More than 1 hour 
D)  None of the above; bubbles are not an issue 
A)  Less than 1 hour 
B)  1 hour 
C)  More than 1 hour 
D)  None of the above; bubbles are not an issue

Question 6

Which type of impression material is the most popular for restorative procedures?

Accepted Answer

A)  Polyether 
B)  Polysulfide 
C)  Hydrocolloid 
D)  Addition silicone 
A)  Polyether 
B)  Polysulfide 
C)  Hydrocolloid 
D)  Addition silicone

Question 7

If an alginate impression is left to soak in a wet environment, the material will expand by which process?

Accepted Answer

A)  Syneresis 
B)  Hysteresis 
C)  Imbibition 
D)  Dimensional change 
A)  Syneresis 
B)  Hysteresis 
C)  Imbibition 
D)  Dimensional change

Question 8

Early elastomeric impression materials include which of the following materials?

Accepted Answer

A)  Polyether 
B)  Polyvinyl siloxane 
C)  Condensation silicone 
D)  All of the above 
E)  Only A and C 
A)  Polyether 
B)  Polyvinyl siloxane 
C)  Condensation silicone 
D)  All of the above 
E)  Only A and C

Question 9

How is alginate hydrocolloid supplied?

Accepted Answer

A)  Powder 
B)  Compules 
C)  Thixotropic gel 
D)  Two syringes to be mixed together 
E)  Two tubs as a putty system for hand kneading 
A)  Powder 
B)  Compules 
C)  Thixotropic gel 
D)  Two syringes to be mixed together 
E)  Two tubs as a putty system for hand kneading

Question 10

Explain why an elastomeric bite registration might be preferable to a wax bite registration.

Accepted Answer

Bite registrations in the past have been

Question 11

Which of the following is a rigid dental impression material?

Accepted Answer

A)  Polyether 
B)  Polysulfide 
C)  Addition silicone 
D)  Zinc oxide-eugenol 
A)  Polyether 
B)  Polysulfide 
C)  Addition silicone 
D)  Zinc oxide-eugenol

Question 12

Alginate impressions prepared from extended storage products usually can be stored under proper conditions for up to _____ without serious dimensional changes.

Accepted Answer

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

Question 13

What is the ANSI-ADA requirement for recovery of alginate impression materials?

Accepted Answer

A)  80% 
B)  85% 
C)  90% 
D)  95% 
A)  80% 
B)  85% 
C)  90% 
D)  95%

Question 14

Digital impressions are not as accurate as elastomeric impressions. CAD/CAM requires a milling machine in order fabricate the indirect restoration.

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 15

Which of the following is not true about alginate substitute materials?

Accepted Answer

A)  Higher dimensional stability 
B)  Greater accuracy 
C)  Better recovery 
D)  Lower cost 
A)  Higher dimensional stability 
B)  Greater accuracy 
C)  Better recovery 
D)  Lower cost

Question 16

Which term describes the process through which alginate gels shrink and lose water?

Accepted Answer

A)  Syneresis 
B)  Imbibition 
C)  Dehydration 
D)  Agglutination 
E)  Agglomeration 
A)  Syneresis 
B)  Imbibition 
C)  Dehydration 
D)  Agglutination 
E)  Agglomeration

Question 17

What is the dimensional change of addition silicone after 24 hours?

Accepted Answer

A)  ( -0.1% ) 
B)  ( -1% ) 
C)  ( 0.1% ) 
D)  ( 1% ) 
A)  ( -0.1% ) 
B)  ( -1% ) 
C)  ( 0.1% ) 
D)  ( 1% )

Question 18

What is the main disadvantage of alginate hydrocolloid impression material in contrast to an elastomeric impression?

Accepted Answer

A)  Its higher cost 
B)  The amount of equipment necessary 
C)  The inflexibility of the set impression 
D)  Difficulty in mixing and manipulating 
E)  It does not transfer as much surface detail to gypsum dies. 
A)  Its higher cost 
B)  The amount of equipment necessary 
C)  The inflexibility of the set impression 
D)  Difficulty in mixing and manipulating 
E)  It does not transfer as much surface detail to gypsum dies.

Question 19

The impression gives a ________ reproduction of tissue. A ________ reproduction is obtained by pouring dental stone or other suitable material into the impression and allowing it to harden.

Accepted Answer

A)  negative; negative 
B)  positive; positive 
C)  negative; positive 
D)  positive; negative 
A)  negative; negative 
B)  positive; positive 
C)  negative; positive 
D)  positive; negative

Question 20

What is the recommended mixing time of fast-setting alginate?

Accepted Answer

A)  Less than 15 seconds 
B)  30 to 45 seconds 
C)  1.25 minutes 
D)  2 minutes 
A)  Less than 15 seconds 
B)  30 to 45 seconds 
C)  1.25 minutes 
D)  2 minutes

What are the recommendations for mixing alginate?

Impression materials can be classified as those that are flexible and those that are rigid at the time of removal from the mouth. A rigid impression material is restricted to applications in areas where undercuts exist.

Which of the following is correct regarding addition silicone?

Of the following, which will alter setting times for alginates?

Bubbles are produced in gypsum dies if poured within which time period?

Which type of impression material is the most popular for restorative procedures?

If an alginate impression is left to soak in a wet environment, the material will expand by which process?

Early elastomeric impression materials include which of the following materials?

How is alginate hydrocolloid supplied?

Explain why an elastomeric bite registration might be preferable to a wax bite registration.

Which of the following is a rigid dental impression material?

Alginate impressions prepared from extended storage products usually can be stored under proper conditions for up to _____ without serious dimensional changes.

What is the ANSI-ADA requirement for recovery of alginate impression materials?

Digital impressions are not as accurate as elastomeric impressions. CAD/CAM requires a milling machine in order fabricate the indirect restoration.

Which of the following is not true about alginate substitute materials?

Which term describes the process through which alginate gels shrink and lose water?

What is the dimensional change of addition silicone after 24 hours?

What is the main disadvantage of alginate hydrocolloid impression material in contrast to an elastomeric impression?

The impression gives a reproduction of tissue. A reproduction is obtained by pouring dental stone or other suitable material into the impression and allowing it to harden.

What is the recommended mixing time of fast-setting alginate?

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

What are the recommendations for mixing alginate?

Impression materials can be classified as those that are flexible and those that are rigid at the time of removal from the mouth. A rigid impression material is restricted to applications in areas where undercuts exist.

Which of the following is correct regarding addition silicone?

Of the following, which will alter setting times for alginates?

Bubbles are produced in gypsum dies if poured within which time period?

Which type of impression material is the most popular for restorative procedures?

If an alginate impression is left to soak in a wet environment, the material will expand by which process?

Early elastomeric impression materials include which of the following materials?

How is alginate hydrocolloid supplied?

Explain why an elastomeric bite registration might be preferable to a wax bite registration.

Which of the following is a rigid dental impression material?

Alginate impressions prepared from extended storage products usually can be stored under proper conditions for up to _____ without serious dimensional changes.

What is the ANSI-ADA requirement for recovery of alginate impression materials?

Digital impressions are not as accurate as elastomeric impressions. CAD/CAM requires a milling machine in order fabricate the indirect restoration.

Which of the following is not true about alginate substitute materials?

Which term describes the process through which alginate gels shrink and lose water?

What is the dimensional change of addition silicone after 24 hours?

What is the main disadvantage of alginate hydrocolloid impression material in contrast to an elastomeric impression?

The impression gives a ________ reproduction of tissue. A ________ reproduction is obtained by pouring dental stone or other suitable material into the impression and allowing it to harden.

What is the recommended mixing time of fast-setting alginate?

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

The impression gives a reproduction of tissue. A reproduction is obtained by pouring dental stone or other suitable material into the impression and allowing it to harden.