Question 1

Which is not true regarding reversible hydrocolloids?

Accepted Answer

A)  Plastic stops are used during the impression.
B)  The impression procedure requires the use of 3 conditioning baths for the material.
C)  The material is 85% agar and 15% water.
D)  Either tray or syringe material can be used for the impression.E) A) and B)
F) All of the above

Question 2

The three classifications of impressions in dentistry are:

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, determinative.E) B) and D)
F) A) and D)

Question 3

Custom impression trays:

Accepted Answer

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

Question 4

Elastomeric materials use an automix system; what does the extruder gun consist of?

Accepted Answer

A)  A tube of catalyst and base of the same viscosity
B)  A tube of light- and heavy-body material
C)  Either of the above
D)  Neither of the aboveE) None of the above
F) All of the above

Question 5

Alginate material not setting or setting too rapidly may be the result of:

Accepted Answer

A)  expired shelf life.
B)  humidity.
C)  improper storage.
D)  all of the above.E) B) and C)
F) None of the above

Question 6

Alginate impression material can:

Accepted Answer

A)  change color as it sets.
B)  be normal set or fast set.
C)  be supplied with flavoring.
D)  all of the above.E) A) and B)
F) B) and C)

Question 7

Most alginate impressions must be poured within _____ so that distortion does not occur.

Accepted Answer

A)  5 minutes
B)  30 minutes
C)  1 hour
D)  24 hoursE) A) and D)
F) B) and D) C

Question 8

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

Accepted Answer

A)  Use fast-set alginate, as 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 may be done.E) A) and B)
F) None of the above

Question 9

The length or depth of the alginate impression tray borders can be extended by adding _____ to the tray.

Accepted Answer

A)  utility wax
B)  acrylic
C)  boxing wax
D)  border molding compoundE) A) and B)
F) None of the above

Question 10

One of the most popular impression materials used for bite registration is:

Accepted Answer

A)  polysulfide.
B)  zinc oxide-eugenol (ZO
E)  .
C)  polysiloxane.
D)  reversible hydrocolloid.E) All of the above
F) A) and B)

Question 11

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 it useless.E) None of the above
F) A) and B)

Question 12

When taking a wax bite registration,the patient is directed to:

Accepted Answer

A)  bite with the posterior teeth first.
B)  close normally and gently.
C)  occlude with lateral movements.
D)  bite with the anterior teeth first.E) A) and C)
F) A) and B)

Question 13

Which of the following is not considered a classification of impression materials?

Accepted Answer

A)  Preliminary
B)  Final
C)  Temporary
D)  OcclusalE) C) and D)
F) A) and B)

Question 14

A _____ tray covers half of a dental arch.

Accepted Answer

A)  full-arch
B)  section
C)  quadrant
D)  customE) A) and D)
F) All of the above

Question 15

When loading a tray for an upper impression,place:

Accepted Answer

A)  more material toward the anterior and labial edge.
B)  more material in the palatal area.
C)  the material evenly in the tray.
D)  more material toward the posterior and palatal areas.E) None of the above
F) A) and B)

Question 16

Impression trays must be rigid enough to:

Accepted Answer

A)  support the material in the patient's mouth.
B)  warp the completed impression.
C)  both a and b.
D)  neither of the above.E) A) and B)
F) A) and C)

Question 17

What type of impression tray is required with reversible hydrocolloid impressions?

Accepted Answer

A)  Perforated
B)  Disposable
C)  Water-cooled
D)  PlasticE) All of the above
F) B) and D) C

Question 18

What positioning should the EFDA use while taking mandibular and maxillary impressions?

Accepted Answer

A)  Upright
B)  Operator
C)  Subsupine
D)  Four-handed dentistryE) B) and D)
F) All of the above

Question 19

Which of the four types of elastomeric materials has the best dimensional stability?

Accepted Answer

A)  Polysulfide
B)  Polyether
C)  Condensation silicone
D)  PolysiloxaneE) B) and C)
F) All of the above D

Question 20

Final impressions are taken by the:

Accepted Answer

A)  dentist.
B)  dental hygienist.
C)  dental assistant.
D)  laboratory technician.E) All of the above
F) B) and C)

Exam 46: Impression Materials

Which is not true regarding reversible hydrocolloids?

Correct AnswerverifiedShow Answer

The three classifications of impressions in dentistry are:

Correct AnswerverifiedShow Answer

Custom impression trays:

Correct AnswerverifiedShow Answer

Elastomeric materials use an automix system; what does the extruder gun consist of?

Correct AnswerverifiedShow Answer

Alginate material not setting or setting too rapidly may be the result of:

Correct AnswerverifiedShow Answer

Alginate impression material can:

Correct AnswerverifiedShow Answer

Most alginate impressions must be poured within _____ so that distortion does not occur.

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

The length or depth of the alginate impression tray borders can be extended by adding _____ to the tray.

Correct AnswerverifiedShow Answer

One of the most popular impression materials used for bite registration is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When taking a wax bite registration,the patient is directed to:

Correct AnswerverifiedShow Answer

Which of the following is not considered a classification of impression materials?

Correct AnswerverifiedShow Answer

A _____ tray covers half of a dental arch.

Correct AnswerverifiedShow Answer

When loading a tray for an upper impression,place:

Correct AnswerverifiedShow Answer

Impression trays must be rigid enough to:

Correct AnswerverifiedShow Answer

What type of impression tray is required with reversible hydrocolloid impressions?

Correct AnswerverifiedC

What positioning should the EFDA use while taking mandibular and maxillary impressions?

Correct AnswerverifiedShow Answer

Which of the four types of elastomeric materials has the best dimensional stability?

Correct AnswerverifiedD

Final impressions are taken by the:

Correct AnswerverifiedShow Answer

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C

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C

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D

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