Average particle size of powdered gold is________________?
A. 10 um
B. 15 um
C. 30 um
D. 0.1 um
Dental Materials
The pure form of gold used in dentistry is known as___________________?
The pure form of gold used in dentistry is known as___________________?
A. Cohesive gold
B. Non cohesive gold
C. Class I casting gold
D. Class IV casting gold
Electralloy is an alloy of________________?
Electralloy is an alloy of________________?
A. Gold and Platinum
B. Cobalt and Chromium
C. Gold and Calcium
D. Tin and chromium
The carat for Au foil used for restorations is_______________?
The carat for Au foil used for restorations is_______________?
A. 18
B. 20
C. 22
D. 24
Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?
Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?
A. Crystalline
B. Granular gold
C. Mat gold
D. Sponge gold
When Gold fused with porcelain is fired at very high temperature greenish discoloration of cervical margin is due to________________?
When Gold fused with porcelain is fired at very high temperature greenish discoloration of cervical margin is due to________________?
A. High firing temperature
B. Disintegration of opaque layer
C. Presence of copper
D. Formation of excess oxides
Powdered gold is___________________?
Powdered gold is___________________?
A. Made by a combination of chemical precipitation and atomization
B. Made by electrolytic precipitation
C. Made by beating pure gold at high temperatures
D. Made by milling pure gold ingots
Which of the following is true about direct filling gold______________?
Which of the following is true about direct filling gold______________?
A. Properly condensed mat gold has no voids
B. Whatever may be the type voids are inherent
C. Voids can be avoided with manual condensation
D. None of the above
The malleting force is directed______________?
The malleting force is directed______________?
A. Perpendicular to the walls
B. Parallel to long axis of crown
C. 45° to the wall
D. None of the above
Pitting of direct filling old restoration usually results from_________________?
Pitting of direct filling old restoration usually results from_________________?
A. Using contaminated gold foil
B. Poor finished preparation
C. Improper stepg of condenser point
D. Using small condenser point