Dental Materials Ch. 10 Flashcards
if a mold is created for investing and casting does not _ to compensate for the action of the metal alloy, the casting will not fit
a. contract
b. equate
c. expand
d. none
c. expand
the most obvious purpose of the investment is to:
a. enlarge the mold by hygroscopic expansion
b. enlarge the mold by thermal expansion
c. form the mold for the casting
d. provide compensation for contraction
c. form the mold for the casting
porcelain is “best suited” for:
a. full coverage posterior crowns
b. MODFL onlays
c. veneers on anterior teeth
d. MOD inlays
c. veneers on anterior teeth
the crown(s) portion of a dental bridge is called the
a. pontic
b. retainer
c. abutment
d. fixed partial dentur
b. retainer
which wax is hard, leave no burnout residue and has a higher melting temperature?
a. boxing
b. rope
c. sticky
d. baseplate
e. inlay
e. inlay
during the casting procedure, a wax pattern is heated and the wax melts and flows out of the mold. as the temperature continues to rise, any residual wax is burned away. this is called:
a. shrinkage compensation
b. investing
c. burnout
d. crucible heating
c. burnout
identify the correct sequence in the centrifugal casting process
a. add sprue to pattern, place in crucible former, invest and then cast
b. add sprue to pattern, invest, place in crucible former, and then cast
c. place sprue in crucible former, add pattern to sprue, invest and then cast
d. place sprue in crucible former, invest, add pattern to sprue and then cast
a. add sprue to pattern, place in crucible former, invest and then cast
a 33% gold alloy may also be expressed as
a. 10 carat
b. 16 carat
c. 333 fine
d. 33 fine
c. 333 fine
one type of an all-ceramic restoration is cartable glass. all-ceramic restorations are superior to ceramo-metal restorations in all respects
a. first is true, second is false
b. first is false, second is true
c. both are true
d. both are false
b. first is false, second is true
the term used to define the process of firing porcelain powder to become a solid is:
a. liquidating
b. sintering
c. burnishing
d. investing
b. sintering
_____ is the pushing of metal against the tooth to close any gap between the tooth and the casting
a. liquidating
b. sintering
c. burnishing
d. investing
c. burnishing
which is a fixed indirect restoration?
a. amalgam
b. direct gold (gold foil)
c. onlay
d. composite
c. onlay
a restorative material that is placed on the facial surface of anterior teeth to “cover” or hide an esthetic problem is called a:
a. coping
b. veneer
c. buildup (core)
d. pontic
b. veneer
another name for a provisional restoration is a _ restoration
a. conditional
b. non-permanent
c. buildup
d. temporary
d. temporary
silver is classified as a _ metal
a. non-precious
b. high-noble
c. precious
d. noble
c. precious
