A sprue forms a channel in the investment through which the molten alloy travels to form the restoration.Sprues often are wax but also may be plastic or even metal.
A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.
Correct Answer:
Verified
Q21: The blowtorch used to heat casting alloys:
A)
Q22: Investment is retained in a _ while
Q23: Casting alloys are melted using:
A) a blowtorch.
B)
Q24: If a metal sprue is used,it must
Q25: If base-metal castings are pickled,_ will occur.
A)
Q27: Expansion of the binder from added water
Q28: Pickling a casting:
A) removes surface oxides.
B) uses
Q28: Which is the correct order of operations
Q29: The purpose of flux is to minimize:
A)
Q30: Rapidly cooling a casting in cold water
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