In porcelain metal elements are embedded in the matrix of________________? A. Rubber matrixB. Glass C. Plastic D. Resin matrix

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

The opacity in ceramics is achieved by adding_______________? A. Boric oxide B. Copper oxide C. SilicaD. Titanium oxide

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 smallD. Have a higher abrasion resistance than gold