Question 1

How can length or depth of the alginate impression tray borders be extended?

Accepted Answer

A)  Utility wax
B)  Acrylic
C)  Boxing wax
D)  Border molding compoundE) B) and C)
F) B) and D)

Question 2

An impression is a positive reproduction of teeth and surrounding oral tissues.The model created from the impression is a negative reproduction of the structures.

Accepted Answer

A)  Both statements are correct.
B)  Neither statement is correct.
C)  The first statement is correct; the second statement is incorrect.
D)  The first statement is incorrect; the second statement is correct.E) All of the above
F) A) and B)

Question 3

Which statement is correct regarding custom impression trays?

Accepted Answer

A)  They are made from a preliminary model after the dentist has prepared the teeth.
B)  They can be constructed from resin.
C)  They are available only as full-arch trays.
D)  They do not require adhesive if they are smooth surface.E) A) and B)
F) All of the above

Question 4

Elastomeric materials use an Automix system.The extruder gun insert is either catalyst or base.

Accepted Answer

A)  Both statements are correct.
B)  Neither statement is correct.
C)  The first statement is correct; the second statement is incorrect.
D)  The first statement is incorrect; the second statement is correct.E) All of the above
F) A) and D)

Question 5

Which impression material is used when an extremely accurate final impression is essential?

Accepted Answer

A)  Elastomeric
B)  Alginate
C)  Reversible hydrocolloid
D)  Light-curedE) None of the above
F) All of the above

Question 6

Why must impression trays be rigid?

Accepted Answer

A)  Support the material in the patient's mouth.
B)  Warp the completed impression.
C)  Both a and b are correct.
D)  Neither are correct.E) B) and D)
F) None of the above

Question 7

What percent relative humidity is preferred for storing impressions?

Accepted Answer

A)  10
B)  35
C)  70
D)  100E) B) and C)
F) A) and C)

Question 8

How will a water temperature of 80° F (26.6° C) affect an alginate mix?

Accepted Answer

A)  It will make the mix set faster.
B)  It will not change the setting time.
C)  It will make the mix set slower.
D)  It will render the mix useless.E) A) and C)
F) A) and B)

Question 9

An impression tray should be sufficiently deep to allow _____ mm of material between the tray and the incisal or occlusal edges of the teeth.

Accepted Answer

A)  0.5 to 1
B)  2 to 3
C)  4 to 5
D)  6 to 7E) B) and C)
F) A) and C)

Question 10

What can be done to alleviate the gag reflex when taking alginate impressions?

Accepted Answer

A)  Use fast-set alginate, because it allows the impression tray to be removed from the mouth much sooner than if using normal set alginate.
B)  Do not overload the posterior regions of the trays.
C)  Have the patient take deep breaths through the nose.
D)  All of the above can be done.E) B) and C)
F) A) and D)

Question 11

Which of the following is not true regarding an automix system?

Accepted Answer

A)  Elastomeric impression materials are automatically mixed and dispensed via an extruder.
B)  The unit can be used with light-bodied material only.
C)  It provides appropriate amount of material without waste.
D)  Both b and CE) None of the above
F) A) and D)

Question 12

Which material should be used if a more durable impression material is needed for bite registration?

Accepted Answer

A)  Polysulfide
B)  Zinc oxide-eugenol
C)  Polysiloxane
D)  Reversible hydrocolloidE) B) and D)
F) A) and B)

Question 13

What are the three classifications of impressions used in dentistry?

Accepted Answer

A)  Prospective, retrospective, and introspective
B)  Preliminary, functional, and occlusal, or bite, registration
C)  Preliminary, final, and occlusal, or bite, registration
D)  Diagnostic, functional, and determinativeE) None of the above
F) All of the above

Question 14

Which factor should be examined when evaluating the quality of an impression?

Accepted Answer

A)  The presence of the retromolar area and maxillary tuberosity are recorded.
B)  Anatomical detail is sharp and not distorted.
C)  Surfaces are free from voids.
D)  All of the above are factors.E) C) and D)
F) None of the above

Question 15

Which type of elastomeric material has the highest viscosity?

Accepted Answer

A)  Light-bodied
B)  Regular-bodied
C)  Heavy-bodied
D)  PuttyE) C) and D)
F) None of the above

Question 16

Although technique may vary,when assisting a dentist in taking an elastomeric impression,mix the light-bodied material first.

Accepted Answer

A) True 
 B)False

Question 17

What are the three curing stages of impression materials?

Accepted Answer

A)  First impression, setting phase, final impression
B)  Initial set, final set, final cure
C)  Initial impression, curing stage, final impression
D)  First set, curing set, final setE) B) and C)
F) A) and D)

Question 18

Which type of reversible hydrocolloid material is the most viscous?

Accepted Answer

A)  Syringe
B)  Plate
C)  Tempered
D)  TrayE) All of the above
F) A) and B)

Question 19

Which irreversible hydrocolloid material is used most widely for preliminary impressions?

Accepted Answer

A)  Light-bodied
B)  Alginate
C)  Polysulfide
D)  PolyetherE) A) and C)
F) None of the above

Question 20

What does the term syneresis mean as it relates to alginate impression?

Accepted Answer

A)  Water evaporates from the impression.
B)  The mix changes colors.
C)  Excess moisture is absorbed by the impression.
D)  The mixing time is increased.E) A) and C)
F) None of the above

Exam 46: Impression Materials

What can be done to alleviate the gag reflex when taking alginate impressions?

Correct AnswerverifiedShow Answer

An impression tray should be sufficiently deep to allow _____ mm of material between the tray and the incisal or occlusal edges of the teeth.

Correct AnswerverifiedShow Answer

An impression is a positive reproduction of teeth and surrounding oral tissues.The model created from the impression is a negative reproduction of the structures.

Correct AnswerverifiedShow Answer

Which type of elastomeric material has the highest viscosity?

Correct AnswerverifiedShow Answer

Which factor should be examined when evaluating the quality of an impression?

Correct AnswerverifiedShow Answer

What percent relative humidity is preferred for storing impressions?

Correct AnswerverifiedShow Answer

What are the three curing stages of impression materials?

Correct AnswerverifiedShow Answer

How will a water temperature of 80° F (26.6° C) affect an alginate mix?

Correct AnswerverifiedShow Answer

Which material should be used if a more durable impression material is needed for bite registration?

Correct AnswerverifiedShow Answer

Which statement is correct regarding custom impression trays?

Correct AnswerverifiedShow Answer

Which type of reversible hydrocolloid material is the most viscous?

Correct AnswerverifiedShow Answer

What does the term syneresis mean as it relates to alginate impression?

Correct AnswerverifiedShow Answer

Which impression material is used when an extremely accurate final impression is essential?

Correct AnswerverifiedShow Answer

Which of the following is not true regarding an automix system?

Correct AnswerverifiedShow Answer

How can length or depth of the alginate impression tray borders be extended?

Correct AnswerverifiedShow Answer

What are the three classifications of impressions used in dentistry?

Correct AnswerverifiedShow Answer

Although technique may vary,when assisting a dentist in taking an elastomeric impression,mix the light-bodied material first.

Correct AnswerverifiedShow Answer

Elastomeric materials use an Automix system.The extruder gun insert is either catalyst or base.

Correct AnswerverifiedShow Answer

Which irreversible hydrocolloid material is used most widely for preliminary impressions?

Correct AnswerverifiedShow Answer

Why must impression trays be rigid?

Correct AnswerverifiedShow Answer

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