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
A. 19%
B. 2%
C. 1.7%
D. 4%
The maximum carbon content of steel used in dentistry is__________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Remove the oxides formed on the gold alloy
B. Lower the melting point
C. Replace casting wax
D. Speed the burnout process
Flux is used during casting to________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. High quality iron
B. Chrome
C. Cobalt
D. Nickel
Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Ease of construction of denture
B. Preserving the sulci
C. Ease of pouring an impression
D. All of the above
Which is the use of boxing an impression______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. ¼ inch
B. ½ inch
C. 3/8 inch
D. one inch
Gap between true end of casting ring and wax pattern should be______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Decrease its strength and ability to be hardened
B. Decrease its tarnish resistance
C. Increase its fusion temperature
D. Redden the alloy
Addition of large amounts of platinum to a casting gold alloy will________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. They have a modulus of elasticity twice that of gold alloys
B. They are more rigid than gold alloys
C. They have higher ductility than gold alloys
D. They have a lower proportional limit than gold alloys
All of the following statements about cast cobalt alloy are true EXCEPT_____________? Read More »
Dental Materials, Medical Mcqs, Metallurgy