Question 1

The mixing time of fast-setting alginate is:

Accepted Answer

A)   less than 15 seconds.
B)   30 to 45 seconds.
C)   1.25 minutes.
D)   2 minutes.E) A) and B)
F) A) and C)

Question 2

Alginate hydrocolloid is recommended:

Accepted Answer

A)   for preparation of study models.
B)   for impressions of cavity preparations.
C)   in the preparation of athletic mouth protectors.
D)   for A, B, and C.
E)   for A and C.F) A) and E)
G) All of the above E

Question 3

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 weeksF) A) and E)
G) C) and D) D

Question 4

If an alginate impression is left to sit in a dry environment,the material will shrink.This process is known as:

Accepted Answer

A)   imbibition.
B)   syneresis.
C)   dimensional change.
D)   hysteresis.E) None of the above
F) A) and B)

Question 5

With time,alginate gels shrink and lose water through a process called:

Accepted Answer

A)   imbibition.
B)   syneresis.
C)   agglomeration.
D)   agglutination.
E)   dehydration.F) C) and D)
G) A) and C)

Question 6

An advantage of using an elastomeric impression material over an irreversible hydrocolloid is it:

Accepted Answer

A)   is less expensive.
B)   is the best material for study models.
C)   has greater dimensional accuracy.
D)   is a reversible process.E) A) and B)
F) None of the above

Question 7

Bubbles are produced in gypsum dies if poured in:

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.E) A) and D)
F) A) and C)

Question 8

Early elastomeric impression materials included:

Accepted Answer

A)   polyether.
B)   condensation silicone.
C)   polysulfide.
D)   all of the above.
E)   only A and C.F) A) and C)
G) A) and B)

Question 9

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.E) A) and B)
F) A) and C)

Question 10

Recommendations for mixing the alginate include:

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.F) All of the above
G) A) and B)

Question 11

An advantage of using premeasured packets of alginate material includes packets are:

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.F) D) and E)
G) B) and E)

Question 12

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

Accepted Answer

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

Question 13

Alginate impression material may be referred to as a(n) :

Accepted Answer

A)   addition silicone.
B)   condensation silicone.
C)   polyether.
D)   irreversible hydrocolloid.
E)   reversible hydrocolloid.F) C) and D)
G) A) and B)

Question 14

Advantages of elastomeric impression materials in contrast to alginate hydrocolloid materials include:

Accepted Answer

A)   greater accuracy.
B)   dimensional stability with time.
C)   ability to record detail.
D)   both A and C.E) B) and D)
F) C) and D)

Question 15

Dimensional change of addition silicone after 24 hours is:

Accepted Answer

A)   -0.1%.
B)   -1%.
C)   0.1%.
D)   1%.E) None of the above
F) A) and B)

Question 16

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.E) B) and C)
F) A) and C)

Question 17

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

Accepted Answer

A)   Addition silicone
B)   Polyether
C)   Polysulfide
D)   HydrocolloidE) A) and B)
F) A) and C)

Question 18

Which of the following is a rigid dental impression material?

Accepted Answer

A)   Addition silicone
B)   Zinc oxide-eugenol
C)   Polyether
D)   PolysulfideE) B) and D)
F) A) and D)

Question 19

Addition silicone putties:

Accepted Answer

A)   should not be mixed with bare hands.
B)   may be mixed with bare hands.
C)   should not be mixed when latex rubber gloves are worn.
D)   A and C.
E)   B and C.F) C) and E)
G) A) and E) E

Question 20

A maxillary impression tray should:

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.E) A) and C)
F) None of the above

Exam 8: Impression Materials

The mixing time of fast-setting alginate is:

Correct AnswerverifiedShow Answer

Alginate hydrocolloid is recommended:

Correct AnswerverifiedE

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

Correct AnswerverifiedD

If an alginate impression is left to sit in a dry environment,the material will shrink.This process is known as:

Correct AnswerverifiedShow Answer

With time,alginate gels shrink and lose water through a process called:

Correct AnswerverifiedShow Answer

An advantage of using an elastomeric impression material over an irreversible hydrocolloid is it:

Correct AnswerverifiedShow Answer

Bubbles are produced in gypsum dies if poured in:

Correct AnswerverifiedShow Answer

Early elastomeric impression materials included:

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

Recommendations for mixing the alginate include:

Correct AnswerverifiedShow Answer

An advantage of using premeasured packets of alginate material includes packets are:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Alginate impression material may be referred to as a(n) :

Correct AnswerverifiedShow Answer

Advantages of elastomeric impression materials in contrast to alginate hydrocolloid materials include:

Correct AnswerverifiedShow Answer

Dimensional change of addition silicone after 24 hours is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is a rigid dental impression material?

Correct AnswerverifiedShow Answer

Addition silicone putties:

Correct AnswerverifiedE

A maxillary impression tray should:

Correct AnswerverifiedShow Answer

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E

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D

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E

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