471. Porcelain binds to metal in PFM crown by_________________?

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

472. Dicor restoration is_______________?

A. Two coloured restorations
B. Heat pressed ceramics
C. Castabel ceramic
D. None of the above

473. Opaque porcelain________________?

A. Is Feldspathic glass
B. Contains opacifier like zirconium and titanium oxide
C. Not used to mask the colour of the cement used in placing of restoration
D. Used to produce the characteristic translucence, which is an inherent aspect of the incisal edge in natural teeth

474. Flux used in dental ceramic is________________?

A. Alumina
B. Silica
C. Kaolin
D. Boric oxide

475. Which is not present in porcelain________________?

A. Silica
B. Feldspar
C. Calcium carbonate
D. Amorphous material

476. Machineable glass ceramic is________________?

A. Cerestore
B. Decor MGC
C. Infusium
D. Leucite

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

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

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

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

479. 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

480. The opacity in ceramics is achieved by adding_______________?

A. Boric oxide
B. Copper oxide
C. Silica
D. Titanium oxide

NOTE
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