Medical Mcqs

Pickling________________?
  • (A)  Is accomplished by soaking the casting in baking soda
  • (B)  Causes porosity in gold
  • (C)  Removes surface oxides from gold castings
  • (D)  Remove investment from gold casting
Silica sol__________________?
  • (A)  Is applied to the walls of the investment to produce hygroscopic expansion
  • (B)  Increase the strength and the setting expansion of the phosphate-bonded investment
  • (C)  Acts as a retarder in the silica bonded investments
  • (D)  Acts as a refractory in the Silica bonded investments