MCPHS Dental Materials Final Exam (all
crossword vocab); Qs & As
condensation silicone Correct Answer-impression material that is very
hydrophobic, must be poured immediately, usually has many voids
sodium phosphate Correct Answer-common additive to alginate that acts as
a retarder to slow down working time
hygroscopic expansion Correct Answer-if the gypsum becomes immersed
into water or comes in contact with water while setting the gypsum will take-up
additional water; swells
calcination Correct Answer-The process whereby water is lost when gypsum
is heated during manufacturing
study model cast Correct Answer-is a positive reproduction of both maxillary
and mandibular, is a positive reproduction of the hard & soft tissues of the oral
cavity
wet strength Correct Answer-from start of pour to one hour after, water still
present
one minute Correct Answer-mixing time for alginate
calcium sulfate dihydrate Correct Answer-main component of gypsum, still
contains water content
2-3 minutes Correct Answer-setting time of alginate
, MCPHS Dental Materials Final Exam (all
crossword vocab); Qs & As
. Correct Answer-.
final setting time Correct Answer-from start of mix to rigid mass that can be
separated from impression, minimum 1-hour/safe to separate, not fully set
10 minutes Correct Answer-disinfection time of alginate impression
syneresis Correct Answer-Water exudes causing the impression contracts
positive reproduction Correct Answer-study model/cast of oral structures
hysteresis Correct Answer-melting point much higher than boiling point, and
gelling at mouth temperature
setting expansion Correct Answer-the slight swelling of the gypsum while it is
getting hard, crystals push against each other creating porosities
dry strength Correct Answer-reached in 24-hours, water has evaporated , 2X
as great as wet strength
diatomaceous earth Correct Answer-silica, inert filler used in alginate; Gives
the material 'body'
, MCPHS Dental Materials Final Exam (all
crossword vocab); Qs & As
reversible hydrocolloid Correct Answer-impression material used for crowns,
requires special equipment, water cooled trays, can be softened and reused
exothermic reaction Correct Answer-gives off heat as it set or gets hard
Gilmore needle Correct Answer-device used to determine setting time of
gypsum
Hydration Correct Answer-When mixed with water, the hemihydrate is
converted back to dihydrate
polysulfide material Correct Answer-rubber base impression material, used
for dentures, special spatula, long working time 4-6 minutes
imbibition Correct Answer-Water may be absorbed causing the impression to
swell
addition silicone Correct Answer-impression material used for crowns, comes
in two tubes or a gun and cartridge
initial setting time Correct Answer-working time, loss of gloss of gypsum
becomes semi-hard, 5-7-minutes
24 hours Correct Answer-hydration reaction completed, gypsum fully set
crossword vocab); Qs & As
condensation silicone Correct Answer-impression material that is very
hydrophobic, must be poured immediately, usually has many voids
sodium phosphate Correct Answer-common additive to alginate that acts as
a retarder to slow down working time
hygroscopic expansion Correct Answer-if the gypsum becomes immersed
into water or comes in contact with water while setting the gypsum will take-up
additional water; swells
calcination Correct Answer-The process whereby water is lost when gypsum
is heated during manufacturing
study model cast Correct Answer-is a positive reproduction of both maxillary
and mandibular, is a positive reproduction of the hard & soft tissues of the oral
cavity
wet strength Correct Answer-from start of pour to one hour after, water still
present
one minute Correct Answer-mixing time for alginate
calcium sulfate dihydrate Correct Answer-main component of gypsum, still
contains water content
2-3 minutes Correct Answer-setting time of alginate
, MCPHS Dental Materials Final Exam (all
crossword vocab); Qs & As
. Correct Answer-.
final setting time Correct Answer-from start of mix to rigid mass that can be
separated from impression, minimum 1-hour/safe to separate, not fully set
10 minutes Correct Answer-disinfection time of alginate impression
syneresis Correct Answer-Water exudes causing the impression contracts
positive reproduction Correct Answer-study model/cast of oral structures
hysteresis Correct Answer-melting point much higher than boiling point, and
gelling at mouth temperature
setting expansion Correct Answer-the slight swelling of the gypsum while it is
getting hard, crystals push against each other creating porosities
dry strength Correct Answer-reached in 24-hours, water has evaporated , 2X
as great as wet strength
diatomaceous earth Correct Answer-silica, inert filler used in alginate; Gives
the material 'body'
, MCPHS Dental Materials Final Exam (all
crossword vocab); Qs & As
reversible hydrocolloid Correct Answer-impression material used for crowns,
requires special equipment, water cooled trays, can be softened and reused
exothermic reaction Correct Answer-gives off heat as it set or gets hard
Gilmore needle Correct Answer-device used to determine setting time of
gypsum
Hydration Correct Answer-When mixed with water, the hemihydrate is
converted back to dihydrate
polysulfide material Correct Answer-rubber base impression material, used
for dentures, special spatula, long working time 4-6 minutes
imbibition Correct Answer-Water may be absorbed causing the impression to
swell
addition silicone Correct Answer-impression material used for crowns, comes
in two tubes or a gun and cartridge
initial setting time Correct Answer-working time, loss of gloss of gypsum
becomes semi-hard, 5-7-minutes
24 hours Correct Answer-hydration reaction completed, gypsum fully set
