Final Exam
A(n) _____ is an accurate replica of the prepared portion of a tooth used in
the laboratory during the fabrication of a cast restoration such as a porcelain-
fused-to-metal crown.
A) hemihydrate
B) articulator
C) die - correct answer ✔C
The ragwheel must be _____ after each use.
A) discarded
B) sterilized
C) washed
D) disinfected - correct answer ✔B
Which statement regarding infection control in the dental laboratory is
accurate?
A) It is not as critical as when you are with a patient.
B) It is equally as important as when you are with a patient.
C) It depends on the patient's medical/dental history.
D) It is not a consideration because impressions are always disinfected
chairside. - correct answer ✔B
You have just removed an alginate impression from your patient's mouth.
Your next step is to:
,A) spray with disinfectant
B) pour up model
C) immerse in disinfectant
D) rinse with water to remove bioburden - correct answer ✔D
Which wax would you use to surround the impression creating a wall before
pouring it?
A) utility wax
B) baseplate wax
C) boxing wax
D) none of these - correct answer ✔C
When making a whitening tray you'll need thermoplastic material, models,
damp paper towel, vacuum former, block out material (if desired), and _____.
A) sandblaster
B) bur and handpiece
C) scissors
D) lathe and ragwheel - correct answer ✔C
What would the power to water ratio be for dental stone if you measured 200
grams of powder?
A) 60-62 mL
B) 90-100 mL
, C) 38-48 mL
D) None of these are correct. - correct answer ✔A
What wax is used to treat irritation in the cheeks and lips from orthodontic
treatment?
A) boxing wax
B) casting wax
C) utility wax
D) baseplate wax - correct answer ✔C
A _____ is used to remove air from a mix of plaster or stone and to aid in the
flow of material when pouring up a diagnostic model or cast.
A) vibrator
B) sandblaster
C) articulator
D) vacuum-former - correct answer ✔A
What causes air bubbles in a model?
A) Impression material is too thick.
B) Quickly pouring the impression.
C) Adding gypsum in small increments. - correct answer ✔B
_____ is a mixture of gypsum and water used in the finishing of models or can
also be used to make a model set up faster.
A(n) _____ is an accurate replica of the prepared portion of a tooth used in
the laboratory during the fabrication of a cast restoration such as a porcelain-
fused-to-metal crown.
A) hemihydrate
B) articulator
C) die - correct answer ✔C
The ragwheel must be _____ after each use.
A) discarded
B) sterilized
C) washed
D) disinfected - correct answer ✔B
Which statement regarding infection control in the dental laboratory is
accurate?
A) It is not as critical as when you are with a patient.
B) It is equally as important as when you are with a patient.
C) It depends on the patient's medical/dental history.
D) It is not a consideration because impressions are always disinfected
chairside. - correct answer ✔B
You have just removed an alginate impression from your patient's mouth.
Your next step is to:
,A) spray with disinfectant
B) pour up model
C) immerse in disinfectant
D) rinse with water to remove bioburden - correct answer ✔D
Which wax would you use to surround the impression creating a wall before
pouring it?
A) utility wax
B) baseplate wax
C) boxing wax
D) none of these - correct answer ✔C
When making a whitening tray you'll need thermoplastic material, models,
damp paper towel, vacuum former, block out material (if desired), and _____.
A) sandblaster
B) bur and handpiece
C) scissors
D) lathe and ragwheel - correct answer ✔C
What would the power to water ratio be for dental stone if you measured 200
grams of powder?
A) 60-62 mL
B) 90-100 mL
, C) 38-48 mL
D) None of these are correct. - correct answer ✔A
What wax is used to treat irritation in the cheeks and lips from orthodontic
treatment?
A) boxing wax
B) casting wax
C) utility wax
D) baseplate wax - correct answer ✔C
A _____ is used to remove air from a mix of plaster or stone and to aid in the
flow of material when pouring up a diagnostic model or cast.
A) vibrator
B) sandblaster
C) articulator
D) vacuum-former - correct answer ✔A
What causes air bubbles in a model?
A) Impression material is too thick.
B) Quickly pouring the impression.
C) Adding gypsum in small increments. - correct answer ✔B
_____ is a mixture of gypsum and water used in the finishing of models or can
also be used to make a model set up faster.
