A. Casts
B. Models
C. Investment
D. Dies
Setting expansion is advantageous in__________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Using asbestos linear
B. Placing the sprue at least one quarter inch away form the end of casting ring
C. Preventing rapid heating the investment in burnout oven
D. Using a short and wide sprue
Back pressure porosity can be avoided by________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Reducing flame
B. Oxidizing flame
C. Green flame
D. All of the above
Which of the following zones is used for melting alloy during casting______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Warm HCI
B. Cold HF
C. Cold H2SO4
D. Sand blasting with aluminium oxide
Cleaning of base metal alloy is done by______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. a titanium
B. B titanium
C. Chrome-cobalt-nickel
D. Nickel-titanium
Which one of the following is most elastic ? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Produce a smoother casting
B. Decrease setting expansion
C. Increase setting expansion
D. Increase thermal expansion
A thinner mix of a gypsum bonded investment will_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Tempering
B. Work hardening
C. Age hardening
D. Precipitation hardening
Stainless steel orthodontic wire can be hardened by________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Is accomplished by soaking the casting in baking soda
B. Causes porosity in gold
C. Removes surface oxides from gold castings
D. Remove investment from gold casting
Pickling________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Shape memory
B. Hyper rigidity
C. Corrosion resistance
D. Weldable properties
NiTi alloy have_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Martensite
B. Ferrite
C. Austenite
D. Pearlite
The main form of iron carbide found in 18-8 steel________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy