Tublulence of molten gold is due to _____________?
A. Impurities in gold
B. Improper venting
C. A and B
D. None of the above
Metallurgy
In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
In a patient with allergy to costume jewelry, which of the following is contraindicated______________?
A. High gold
B. Low gold
C. Palladium – Ag
D. Ni – Cr
Indium in metal alloys_______________?
Indium in metal alloys_______________?
A. Improve bonding
B. Harden the metal ceramic Ag-Pd alloy
C. Both A and B
D. None of the above
Mouth temperature waxes are_______________?
Mouth temperature waxes are_______________?
A. Iowa wax
B. Modeling wax
C. Green stick wax
D. None of the above
Incomplete casting is the result of_____________?
Incomplete casting is the result of_____________?
A. More porous investment in the mould
B. Narrow sprue diameter
C. Hollow sprue
D. Large reservoir
Glossy smooth margins of a casting are due to_____________?
Glossy smooth margins of a casting are due to_____________?
A. Shrinkage of alloy on cooling
B. Investment breakdown
C. Incomplete wax elimination
D. Incomplete gas elimination
Gypsum bonded investment should not be heated over______________?
Gypsum bonded investment should not be heated over______________?
A. 700°C
B. 1,300°C
C. 1,063°C
D. 900°C
Cobalt-Chrominum alloys contains_______________?
Cobalt-Chrominum alloys contains_______________?
A. 30% cobalt and 60% chrominum
B. 60% cobalt and 30% chrominum
C. 1% palladium
D. 20% gold
The most commonly used Titanium alloy for dental and medical purposes is________________?
The most commonly used Titanium alloy for dental and medical purposes is________________?
A. Ti 6Al 4V
B. Ti 5Al 4V
C. Ti 5Al 5V
D. Ti 6Al 6V
Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?
Wax pattern is ideally invested immediately to decrease the dimensional changes caused by_______________?
A. Decrease flow
B. Continuous expansion
C. Relaxation of the internal stresses
D. Water loss