The cohesive gold used as bulk filler is_____________?
The cohesive gold used as bulk filler is_____________?
A. Electra alloy
B. Mat gold
C. Spherical gold
D. Gold foll
Dental Materials
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Chemical tempering in porcelains is done to interrupt crack propagation by______________?
Chemical tempering in porcelains is done to interrupt crack propagation by______________?A. Transformation toughening
B. Dispersion of crystalline phase
C. Inducing residual compressive strength
D. All of the above -
To prevent porosity in dental porcelain it should be backed________________?
To prevent porosity in dental porcelain it should be backed________________?A. Boric oxide
B. In vacuum
C. For long period
D. Under pressure -
Pyroplastic flow of porcelain is due to___________________?
Pyroplastic flow of porcelain is due to___________________?A. High temperature during glazing
B. Low temperature during glazing
C. Improper condensation
D. High firing temperature -
Condensation shrinkage of porcelain during firing depends on__________________?
Condensation shrinkage of porcelain during firing depends on__________________?A. Rate of arriving at firing temperature
B. Uniformity of particle size
C. Shape and size of particle
D. Type of investment used -
Porcelain is best fired__________________?
Porcelain is best fired__________________?A. In open air
B. Under air compression
C. When several layer are fired simultaneously
D. Under minimum pressure -
Porosity in porcelain can be prevented by_______________?
Porosity in porcelain can be prevented by_______________?A. Thoroughness of condensation
B. Rapidity of firing
C. High firing temperature
D. All of the above -
Which of the following is the main constituent of porcelain__________________?
Which of the following is the main constituent of porcelain__________________?A. Feldspar
B. Kaolin
C. Quartz
D. Clay -
The best tissue tolerated material for crown and bridge_______________?
The best tissue tolerated material for crown and bridge_______________?A. Highly polished porcelain
B. Highly polished acrylic
C. Highly glazed porcelain
D. Highly polished metal -
Dental porcelains are crystalline materials of________________?
Dental porcelains are crystalline materials of________________?A. Rubber
B. Plastic
C. Organic substances
D. Glass