A. Exchange of aluminium and sodium ions
B. Exchange of aluminium and potassium ions
C. Exchange of sodium and potassium ions
D. None of the above
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 - Porcelain denture teeth________________?
A. Have a higher coefficient of thermal expansion than acrylic teeth:
B. Have a lower abrasion resistance than enamel
C. Should be used where the inter dental clearance is small
D. Have a higher abrasion resistance than gold - In porcelain metal elements are embedded in the matrix of________________?
A. Rubber matrix
B. Glass
C. Plastic
D. Resin matrix - Phenomenon in which porcelain appears different under varying light condition is______________?
A. Translucency
B. Refractive optics
C. Metamerism
D. Opacification - Porcelain binds to metal in PFM crown by_________________?
A. Metallic bind
B. Transparency
C. Chemical bond
D. B and C - 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 - Porosity in porcelain can be prevented by_______________?
A. Thoroughness of condensation
B. Rapidity of firing
C. High firing temperature
D. All of the above - Porcelain is best fired__________________?
A. In open air
B. Under air compression
C. When several layer are fired simultaneously
D. Under minimum pressure - To prevent porosity in dental porcelain it should be backed________________?
A. Boric oxide
B. In vacuum
C. For long period
D. Under pressure
