Question 1

Storing set alginate _____ will result in the least dimensional change.

Accepted Answer

A)  under water 
B)  in dry air 
C)  in air approaching 50% relative humidity 
D)  in air approaching 100% relative humidity 
A)  under water 
B)  in dry air 
C)  in air approaching 50% relative humidity 
D)  in air approaching 100% relative humidity

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

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 4

Which of the following factors limit(s)the accuracy of wax bite registrations?

Accepted Answer

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

Question 5

An accepted method for modifying an impression tray would include:

Accepted Answer

A)  applying rope wax to the flanges. 
B)  heating the tray to alter the configuration. 
C)  adding compound to the edges. 
D)  none of the above. 
A)  applying rope wax to the flanges. 
B)  heating the tray to alter the configuration. 
C)  adding compound to the edges. 
D)  none of the above.

Question 6

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 7

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 8

The main disadvantage of alginate hydrocolloid impression material in contrast to an elastomeric impression is:

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

Alginate hydrocolloid is supplied:

Accepted Answer

A)  in compules. 
B)  in two syringes to be mixed together. 
C)  in two tubs as a putty system for hand kneading. 
D)  as a thixotropic gel. 
E)  as a powder. 
A)  in compules. 
B)  in two syringes to be mixed together. 
C)  in two tubs as a putty system for hand kneading. 
D)  as a thixotropic gel. 
E)  as a powder.

Question 12

Permanent deformation increases when:

Accepted Answer

A)  the time before testing is lengthened. 
B)  the amount of deformation during removal is decreased. 
C)  the time that is held under compression is decreased. 
D)  thinner mixes are used. 
A)  the time before testing is lengthened. 
B)  the amount of deformation during removal is decreased. 
C)  the time that is held under compression is decreased. 
D)  thinner mixes are used.

Question 13

The best method for delaying the setting of alginate is to:

Accepted Answer

A)  reduce the water temperature. 
B)  increase the water temperature. 
C)  use a thinner mix of alginate. 
D)  use a thicker mix of alginate. 
A)  reduce the water temperature. 
B)  increase the water temperature. 
C)  use a thinner mix of alginate. 
D)  use a thicker mix of alginate.

Question 14

The strength of alginate material _____ if a _____ mixture is used.

Accepted Answer

A)  increases; thinner. 
B)  increases; thicker. 
C)  decreases; thinner. 
D)  decreases; thicker. 
E)  Both B and D are correct.
F) Both A and C are correct. 
A)  increases; thinner. 
B)  increases; thicker. 
C)  decreases; thinner. 
D)  decreases; thicker. 
E)  Both B and D are correct.
F) Both A and C are correct.

Question 15

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)  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. 
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.

Question 16

Solutions used to disinfect an impression would include:

Accepted Answer

A)  alcohol. 
B)  sodium hypochlorite. 
C)  iodophor. 
D)  all of the above. 
E)  only B and C. 
A)  alcohol. 
B)  sodium hypochlorite. 
C)  iodophor. 
D)  all of the above. 
E)  only B and C.

Question 17

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

Question 18

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

Accepted Answer

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

Storing set alginate _____ will result in the least dimensional change.

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.

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.

Which of the following factors limit(s)the accuracy of wax bite registrations?

An accepted method for modifying an impression tray would include:

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.

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

The main disadvantage of alginate hydrocolloid impression material in contrast to an elastomeric impression is:

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

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

Alginate hydrocolloid is supplied:

Permanent deformation increases when:

The best method for delaying the setting of alginate is to:

The strength of alginate material _ if a _ mixture is used.

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.

Solutions used to disinfect an impression would include:

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

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

Polymers in Prosthodontics

Dental Ceramics

Dental Implants

Filters

Exam 8: Impression Materials

Storing set alginate _____ will result in the least dimensional change.

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.

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.

Which of the following factors limit(s)the accuracy of wax bite registrations?

An accepted method for modifying an impression tray would include:

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.

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

The main disadvantage of alginate hydrocolloid impression material in contrast to an elastomeric impression is:

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

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

Alginate hydrocolloid is supplied:

Permanent deformation increases when:

The best method for delaying the setting of alginate is to:

The strength of alginate material _____ if a _____ mixture is used.

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.

Solutions used to disinfect an impression would include:

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

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

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.

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.

The strength of alginate material _ if a _ mixture is used.