DH 104 Module 3
What kinds of gloves should be worn when mixing polyvinyl siloxane putty?
a. Latex
b. Nitrile
c. Vinyl
d. None - correct answer ✔c. Vinyl
T/F: Extra alginate should be added to the tray for the patient with a deep
palatal vault. Solid rim lock impression trays do not require adhesive. - correct
answer ✔False
Which of the following is used as a hemostatic agent?
a. Ferric sulfate
b. Aluminum oxide
c. Tin oxide
d. Silicone carbide - correct answer ✔a. Ferric sulfate
T/F: Digital impressions do not require gingival retraction. The impression
process is much easier for patients with digital impressions. - correct answer
✔FALSE, TRUE
Alginate materials are which of the following?
a. Final impression materials
b. Reversible hydrocolloids
c. Irreversible hydrocolloids
d. Inelastic - correct answer ✔c. Irreversible hydrocolloids
,Your patient is claustrophobic and has a strong gag reflex. You need a final
impression material with pleasant characteristics. Which material would you
not chose?
a. Polyvinyl siloxane
b. Addition silicone
c. Polysulfide
d. Polyether - correct answer ✔c. Polysulfide
T/F: Polysulfides are still used for complete denture impressions. - correct
answer ✔True
The practice you work in is located in Denver. You are sending a final
impression to a lab in Seattle to have a gold crown made. Which final
impression material would you not choose due to transit time?
a. Condensation silicone
b. Polyether
c. Polyvinyl siloxane (PVS)
d. Both b and c - correct answer ✔a. Condensation silicone
T/F: Syneresis is the update of fluid by an impression material. - correct
answer ✔False
Which of the following is an inelastic impression material?
a. Agar
b. Zinc oxide eugenol
c. Alginate
d. Condensation silicone putty - correct answer ✔b. Zinc oxide eugenol
, T/F: Racemic epinephrine hemostatic agents can cause blood pressure
spikes. - correct answer ✔True
You are selecting a tray for a mandibular alginate impression. The tray should
extend to which of the following to ensure inclusion of proper anatomy?
a. The tuberosity
b. The retromolar pad
c. The hamular notch
d. The canine eminence - correct answer ✔b. The retromolar pad
T/F: Wax bite registrations are the most dimensionally stable. - correct
answer ✔False
T/F: A retraction cord should always fit end-to-end when placed in the sulcus.
- correct answer ✔False
T/F: Polyether can stay dimensionally stable for 2 weeks. It is hydrophilic and
can absorb disinfecting solutions. - correct answer ✔Both statements are
true.
T/F: The base of a model should be trimmed to size so that it makes up half of
the total depth of the model. Before the casts are trimmed, they should be
immersed in water for 5 minutes to allow for easier trimming. - correct answer
✔Both statements are false.
T/F: Agar and alginate form the best surface detail with gypsum products due
to being water based. - correct answer ✔False
What kinds of gloves should be worn when mixing polyvinyl siloxane putty?
a. Latex
b. Nitrile
c. Vinyl
d. None - correct answer ✔c. Vinyl
T/F: Extra alginate should be added to the tray for the patient with a deep
palatal vault. Solid rim lock impression trays do not require adhesive. - correct
answer ✔False
Which of the following is used as a hemostatic agent?
a. Ferric sulfate
b. Aluminum oxide
c. Tin oxide
d. Silicone carbide - correct answer ✔a. Ferric sulfate
T/F: Digital impressions do not require gingival retraction. The impression
process is much easier for patients with digital impressions. - correct answer
✔FALSE, TRUE
Alginate materials are which of the following?
a. Final impression materials
b. Reversible hydrocolloids
c. Irreversible hydrocolloids
d. Inelastic - correct answer ✔c. Irreversible hydrocolloids
,Your patient is claustrophobic and has a strong gag reflex. You need a final
impression material with pleasant characteristics. Which material would you
not chose?
a. Polyvinyl siloxane
b. Addition silicone
c. Polysulfide
d. Polyether - correct answer ✔c. Polysulfide
T/F: Polysulfides are still used for complete denture impressions. - correct
answer ✔True
The practice you work in is located in Denver. You are sending a final
impression to a lab in Seattle to have a gold crown made. Which final
impression material would you not choose due to transit time?
a. Condensation silicone
b. Polyether
c. Polyvinyl siloxane (PVS)
d. Both b and c - correct answer ✔a. Condensation silicone
T/F: Syneresis is the update of fluid by an impression material. - correct
answer ✔False
Which of the following is an inelastic impression material?
a. Agar
b. Zinc oxide eugenol
c. Alginate
d. Condensation silicone putty - correct answer ✔b. Zinc oxide eugenol
, T/F: Racemic epinephrine hemostatic agents can cause blood pressure
spikes. - correct answer ✔True
You are selecting a tray for a mandibular alginate impression. The tray should
extend to which of the following to ensure inclusion of proper anatomy?
a. The tuberosity
b. The retromolar pad
c. The hamular notch
d. The canine eminence - correct answer ✔b. The retromolar pad
T/F: Wax bite registrations are the most dimensionally stable. - correct
answer ✔False
T/F: A retraction cord should always fit end-to-end when placed in the sulcus.
- correct answer ✔False
T/F: Polyether can stay dimensionally stable for 2 weeks. It is hydrophilic and
can absorb disinfecting solutions. - correct answer ✔Both statements are
true.
T/F: The base of a model should be trimmed to size so that it makes up half of
the total depth of the model. Before the casts are trimmed, they should be
immersed in water for 5 minutes to allow for easier trimming. - correct answer
✔Both statements are false.
T/F: Agar and alginate form the best surface detail with gypsum products due
to being water based. - correct answer ✔False
