The function of a sprue is to_______________?
Correct answer: B. Form an opening of molten metal to enter the mold
- A. Help polish cast restorations
- B. Form an opening of molten metal to enter the mold
- C. Eliminate air bubbles on the wax pattern
- D. Reproduce fine detail
Explanation
The sprue is the channel through which molten alloy flows into and fills the mold cavity. It does not polish the casting, remove bubbles from wax, or itself reproduce fine detail.
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