537Dental MaterialsMedium
Back pressure porosity can be avoided by________?
APreventing rapid heating the investment in burnout oven
BPlacing the sprue at least one quarter inch away form the end of casting ring
CUsing asbestos linear
DUsing a short and wide sprue
Correct answer
B. Placing the sprue at least one quarter inch away form the end of casting ring
Explanation
The correct answer is Placing the sprue at least one quarter inch away form the end of casting ring.