A. Transformation toughening
B. Dispersion of crystalline phase
C. Inducing residual compressive strength
D. All of the above
0
To prevent porosity in dental porcelain it should be backed________________?
0
Pyroplastic flow of porcelain is due to___________________?
A. Boric oxide
B. In vacuum
C. For long period
D. Under pressure
0
Condensation shrinkage of porcelain during firing depends on__________________?
A. High temperature during glazing
B. Low temperature during glazing
C. Improper condensation
D. High firing temperature
0
Porcelain is best fired__________________?
A. Rate of arriving at firing temperature
B. Uniformity of particle size
C. Shape and size of particle
D. Type of investment used
0
Porosity in porcelain can be prevented by_______________?
A. In open air
B. Under air compression
C. When several layer are fired simultaneously
D. Under minimum pressure
0
Which of the following is the main constituent of porcelain__________________?
A. Thoroughness of condensation
B. Rapidity of firing
C. High firing temperature
D. All of the above
0
The best tissue tolerated material for crown and bridge_______________?
A. Feldspar
B. Kaolin
C. Quartz
D. Clay
0
Dental porcelains are crystalline materials of________________?
A. Highly polished porcelain
B. Highly polished acrylic
C. Highly glazed porcelain
D. Highly polished metal
0
The main purpose of adding metallic oxides in ceramic is________________?
A. Rubber
B. Plastic
C. Organic substances
D. Glass
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