41.Recommended size of sprue for wax pattern crowns is:

a. Guaze 8 to 10. b. 10 to 12
c. 10 to 14. d. 12 to 16.

Ans:c ref Skinner’s 10th -496


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38.The largest sized pororsity is:

1. Micro porosity. 2. Pin hole porosity.
3. Suck back porosity 4. Gas inclusion porosity

ANS.3 ref Skinner’s 10th -518


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