Chapter 15: Impression Materials
1. A dental impression material
a. Forms a positive imprint of the oral structures involved
b. Allows the creation of a replica of the structures involved
c. Is always flexible for easy removal from the mouth
d. Is used only for crown and bridge procedures and for
diagnostic casts
(study models): b. Allows the creation of a replica of the
structures involved
2. Which of the following impression materials is transformed
from a sol to a gel state when wet? a. Alginate
b. Polysulfide
c. Polyether
d. Poly vinyl siloxane: a. Alginate
3. All of the following are elastic impression materials except
one. Which one? a. Alginate
b. Polyether impression material
, c. Dental compound
d. Polyvinyl siloxane: c. Dental compound
4. The types of impression materials that are considered
hydrophilic are those that
a. Have a lot of water in them
b. Can be immersed in water without absorbing it
c. Cause water to bead on their surface
d. Have good surface-wetting characteristics: d. Have good
surface-wetting characteristics
5. Hydrophobic impression materials
a. Absorb moisture only after their final set
b. Are the best type of material to use in the mouth
c. Need a dry field to get the best results
d. Provide the best surfaces on gypsum casts, because they
resist the uptake of water during curing of the gypsum: c. Need
a dry field to get the best results
6. Alginate impression material
1. A dental impression material
a. Forms a positive imprint of the oral structures involved
b. Allows the creation of a replica of the structures involved
c. Is always flexible for easy removal from the mouth
d. Is used only for crown and bridge procedures and for
diagnostic casts
(study models): b. Allows the creation of a replica of the
structures involved
2. Which of the following impression materials is transformed
from a sol to a gel state when wet? a. Alginate
b. Polysulfide
c. Polyether
d. Poly vinyl siloxane: a. Alginate
3. All of the following are elastic impression materials except
one. Which one? a. Alginate
b. Polyether impression material
, c. Dental compound
d. Polyvinyl siloxane: c. Dental compound
4. The types of impression materials that are considered
hydrophilic are those that
a. Have a lot of water in them
b. Can be immersed in water without absorbing it
c. Cause water to bead on their surface
d. Have good surface-wetting characteristics: d. Have good
surface-wetting characteristics
5. Hydrophobic impression materials
a. Absorb moisture only after their final set
b. Are the best type of material to use in the mouth
c. Need a dry field to get the best results
d. Provide the best surfaces on gypsum casts, because they
resist the uptake of water during curing of the gypsum: c. Need
a dry field to get the best results
6. Alginate impression material
