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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37.The minimum percentage of binder that should be present in the gypsum bonded investment is:

1. 10%. 2. 25%.
3. 50%. 4. 75%.


ANS.2 REF Skinner’s 10th -472

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