Question 132 (part 2) · LDEK · Dental laboratory technology
One of the most common faults of casting technology is presence of air in the casting molding due to lack of venting canals. Indicate which imperfections visible in the cast are its consequence:
1) cracking of casting molding;
2) wrong size of the cast;
3) incomplete cast;
4) small pearls on the cast surface;
5) dark color of the cast;
6) reverse porosity.
Correct answer is:
2) wrong size of the cast;
3) incomplete cast;
4) small pearls on the cast surface;
5) dark color of the cast;
6) reverse porosity.
Correct answer is:
- A. 1,5.
- B. 2,6.
- C. 2,4.
- D. 1,3.
- E. 3,4.
Hint
Trapped air resists the inflow of molten alloy; think of what this does to thin margins and what fills air bubbles clinging to the pattern.
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