Chemical method of strengthening porcelain involves_________________?

Related Mcqs:

1. 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

2. 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

3. In porcelain metal elements are embedded in the matrix of________________?

   A. Rubber matrix
   B. Glass
   C. Plastic
   D. Resin matrix

4. Phenomenon in which porcelain appears different under varying light condition is______________?

   A. Translucency
   B. Refractive optics
   C. Metamerism
   D. Opacification

5. Porcelain binds to metal in PFM crown by_________________?

   A. Metallic bind
   B. Transparency
   C. Chemical bond
   D. B and C

6. Quartz is Dental porcelain is______________?

   A. Strengthener
   B. Binder
   C. Pigment
   D. Crack minimzer

7. 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

8. Porosity in porcelain can be prevented by_______________?

   A. Thoroughness of condensation
   B. Rapidity of firing
   C. High firing temperature
   D. All of the above

9. Porcelain is best fired__________________?

   A. In open air
   B. Under air compression
   C. When several layer are fired simultaneously
   D. Under minimum pressure

10. To prevent porosity in dental porcelain it should be backed________________?

    A. Boric oxide
    B. In vacuum
    C. For long period
    D. Under pressure