Question 1

Which type of resin is formed into a diagnostic model using heat and a vacuum former?

Accepted Answer

A)  Self-cured
B)  Light-cured
C)  Thermoplastic
D)  Auto-cured

Question 2

Which form of gypsum products is used for the creation of dies?

Accepted Answer

A)  Plaster
B)  Model plaster
C)  Dental stone
D)  High-strength stone

Question 3

When would a light gauge,vacuum-formed resin material be used?

Accepted Answer

A)  Bleaching trays
B)  Provisional coverage
C)  Impression tray
D)  Both a and b D

Question 4

In minutes,how long should one wait before removing a model from an impression after pouring?

Accepted Answer

A)  10 to 15
B)  15 to 30
C)  30 to 45
D)  45 to 60

Question 5

Before constructing a light-cured tray,what would be painted on the model?

Accepted Answer

A)  Adhesive
B)  Plaster
C)  Monomer
D)  Separation medium

Question 6

Which technique listed would be incorrect when pour an impression?

Accepted Answer

A)  In small increments
B)  In large amounts
C)  In the same place
D)  In a continuous flow

Question 7

After fabrication,when can a self-cured resin custom tray be used?

Accepted Answer

A)  After the heat has dissipated
B)  While it is giving off heat
C)  Immediately after construction
D)  After 24 hours

Question 8

A custom impression tray should fit and adapt well to the model and should maintain ____ mm of impression material between itself and the teeth.

Accepted Answer

A)  1 to 2
B)  2 to 3
C)  3 to 4
D)  5 to 6

Question 9

Which of the following gypsum products has the highest powder-to-water ratio?

Accepted Answer

A)  Model plaster
B)  Dental stone
C)  High-strength stone
D)  All gypsum products have the same powder-to-water ratio.

Question 10

How should the patient bite when positioning the bite-fork during a face-bow registration?

Accepted Answer

A)  Quickly
B)  Firmly
C)  Slowly
D)  Slide C

Question 11

Which of the following statements correctly describes the pouring methods used to create the base portion of a dental model?

Accepted Answer

A)  The art portion of the cast is poured first when the double-pour method is used.
B)  The completed box should extend at least 1 inch above the palatal area of the maxillary impression when the box-and-pour method is used.
C)  The inverted-pour method consists of mixing one large mixture of plaster or stone and pouring both portions of the model in a single step.
D)  The "box" used in the box-and-pour method is made of baseplate wax.

Question 12

How will gypsum material be affected if additional powder is added after mixing has begun?

Accepted Answer

A)  Stronger
B)  Weaker
C)  Unaffected
D)  None of the above

Question 13

Which statement regarding infection control in the dental laboratory is accurate?

Accepted Answer

A)  It is equally as important as when you are with a patient.
B)  It is not as critical as when you are with a patient.
C)  It is not a consideration because impressions are disinfected at chairside.
D)  It depends on the patient's medical history.

Question 14

When constructing ______ with a vacuum former,use a heavier-gauge,flexible plastic that does not require a spacer but does require an attachment for the strap.

Accepted Answer

A)  an impression tray
B)  provisional coverage
C)  a vital bleaching tray
D)  a mouth guard

Question 15

How should a plaster mix not be manipulated?

Accepted Answer

A)  Complete mix within 2 minutes.
B)  Press bowl lightly on the vibrator.
C)  Complete mix in 30 seconds.
D)  Mix slowly until smooth.

Question 16

How should light-cured resin tray material be cured?

Accepted Answer

A)  For 10 minutes
B)  Off the model
C)  For 2 minutes
D)  Without the spacer

Question 17

What causes air bubbles in a model?

Accepted Answer

A)  Using a vibrator
B)  Adding stone in small increments
C)  Impression material that is too thick
D)  Improper pouring of the impression

Question 18

What device that holds maxillary and mandibular models in an occlusal relationship?

Accepted Answer

A)  Face bow
B)  Occlusal register
C)  Bite block
D)  Articulator D

Question 19

Which type of dental wax is used to construct occlusal rims and set denture teeth in the wax-up?

Accepted Answer

A)  Bite registration
B)  Baseplate
C)  Utility
D)  Boxing

Question 20

Water should be running through a model trimmer:

Accepted Answer

A)  when turned off.
B)  when trimming.
C)  after trimming.
D)  before trimming.

Exam 47: Laboratory Materials and Procedures

Which type of resin is formed into a diagnostic model using heat and a vacuum former?

Correct AnswerverifiedShow Answer

Which form of gypsum products is used for the creation of dies?

Correct AnswerverifiedShow Answer

When would a light gauge,vacuum-formed resin material be used?

Correct AnswerverifiedD

In minutes,how long should one wait before removing a model from an impression after pouring?

Correct AnswerverifiedShow Answer

Before constructing a light-cured tray,what would be painted on the model?

Correct AnswerverifiedShow Answer

Which technique listed would be incorrect when pour an impression?

Correct AnswerverifiedShow Answer

After fabrication,when can a self-cured resin custom tray be used?

Correct AnswerverifiedShow Answer

A custom impression tray should fit and adapt well to the model and should maintain ____ mm of impression material between itself and the teeth.

Correct AnswerverifiedShow Answer

Which of the following gypsum products has the highest powder-to-water ratio?

Correct AnswerverifiedShow Answer

How should the patient bite when positioning the bite-fork during a face-bow registration?

Correct AnswerverifiedC

Which of the following statements correctly describes the pouring methods used to create the base portion of a dental model?

Correct AnswerverifiedShow Answer

How will gypsum material be affected if additional powder is added after mixing has begun?

Correct AnswerverifiedShow Answer

Which statement regarding infection control in the dental laboratory is accurate?

Correct AnswerverifiedShow Answer

When constructing ______ with a vacuum former,use a heavier-gauge,flexible plastic that does not require a spacer but does require an attachment for the strap.

Correct AnswerverifiedShow Answer

How should a plaster mix not be manipulated?

Correct AnswerverifiedShow Answer

How should light-cured resin tray material be cured?

Correct AnswerverifiedShow Answer

What causes air bubbles in a model?

Correct AnswerverifiedShow Answer

What device that holds maxillary and mandibular models in an occlusal relationship?

Correct AnswerverifiedD

Which type of dental wax is used to construct occlusal rims and set denture teeth in the wax-up?

Correct AnswerverifiedShow Answer

Water should be running through a model trimmer:

Correct AnswerverifiedShow Answer

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D

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C

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D

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