A. Impurities in gold
B. Improper venting
C. A and B
D. None of the above
Tublulence of molten gold is due to _____________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. High gold
B. Low gold
C. Palladium – Ag
D. Ni – Cr
A. Improve bonding
B. Harden the metal ceramic Ag-Pd alloy
C. Both A and B
D. None of the above
Indium in metal alloys_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Iowa wax
B. Modeling wax
C. Green stick wax
D. None of the above
Mouth temperature waxes are_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue
D. Large reservoir
Incomplete casting is the result of_____________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Shrinkage of alloy on cooling
B. Investment breakdown
C. Incomplete wax elimination
D. Incomplete gas elimination
Glossy smooth margins of a casting are due to_____________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. 700°C
B. 1,300°C
C. 1,063°C
D. 900°C
Gypsum bonded investment should not be heated over______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. 30% cobalt and 60% chrominum
B. 60% cobalt and 30% chrominum
C. 1% palladium
D. 20% gold
Cobalt-Chrominum alloys contains_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Ti 6Al 4V
B. Ti 5Al 4V
C. Ti 5Al 5V
D. Ti 6Al 6V
A. Decrease flow
B. Continuous expansion
C. Relaxation of the internal stresses
D. Water loss
