Why do direct filling golds have to be flamed before insertion into the cavity preparation?: (A) To remove contaminants, (B) To make gold soft, (C) To form oxide layer on the surface, (D) All of the above
Answer is A. Proper desorption is a matter of heating long enough at a temperature that removes contaminants and in the case of powdered gold, that burns away the wax.
Ref:Phillip’s Science of Dental Materials ed 12 pg 414