Air bubbles formed on the surface of casting is probably due to________________?
Correct answer: A. Improper wetting of the wax pattern by the investment
- A. Improper wetting of the wax pattern by the investment
- B. Improper heating of the investment
- C. Improper angulation of sprue
- D. Improper casting pressure
Explanation
Air trapped against a poorly wetted wax pattern produces rounded surface bubbles or nodules in the casting. Proper wetting of the pattern with a surfactant helps the investment flow over the surface and displace air.
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