A. Boric oxide
B. In vacuum
C. For long period
D. Under pressure
Related Mcqs:
- For porcelain fused to metal crown, the porcelain should have ______________?
A. High fusion expansion
B. High fusion temperature
C. Linear coefficient of thermal expansion less than that of metal
D. Linear coefficient of thermal expansion more than that of metal - Porosity in porcelain at condensation stage depends on_________________?
A. Shape and size of particle
B. Uniform distribution of particle size
C. Number of particles
D. None of the above - Porosity in porcelain can be prevented by_______________?
A. Thoroughness of condensation
B. Rapidity of firing
C. High firing temperature
D. All of the above - Quartz is Dental porcelain is______________?
A. Strengthener
B. Binder
C. Pigment
D. Crack minimzer - Stage recognized in the firing of dental porcelain given below. Which of state is not correct ?
A. Cold stage bisque
B. Low bisque
C. Medium bisque
D. High bisque - In processing methyl methacrylate, the resin may show porosity if the flask is placed too soon porosity most likely occur_____________?
A. Throughout the denture
B. Near the borders
C. In the thickest part
D. On the denture surface - To prevent porosity in self-cure acrylic resin, curing should be carried in______________?
A. Cold water
B. Hot water
C. Under tap water
D. Under vacuum pressure - High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?
A. Have less marginal breakdown
B. Are workable at lower Hg-alloy ratio
C. Have a higher ratio of tensile to compressive strength
D. Have less resistance to tarnish and corrosion - The main difference between dental stone and dental plaster is______________?
A. Chemical composition
B. Self life
C. Sharpe and size of particles
D. Solubility in water - The American dental association (ADA) specification number for non-aqueous elastomeric dental impression material is______________?
A. 19
B. 20
C. 21
D. 26
