A. Impurities in gold
B. Improper venting
C. A and B
D. None of the above
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
A. Iowa wax
B. Modeling wax
C. Green stick wax
D. None of the above
A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue
D. Large reservoir
A. Shrinkage of alloy on cooling
B. Investment breakdown
C. Incomplete wax elimination
D. Incomplete gas elimination
A. 700°C
B. 1,300°C
C. 1,063°C
D. 900°C
A. 30% cobalt and 60% chrominum
B. 60% cobalt and 30% chrominum
C. 1% palladium
D. 20% gold
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