Question 297 (part 2) · LDEK · Dental laboratory technology
Presence of air in casting form, due to the lack of venting canals or mixing the shielding material without the use of vacuum stirrer are the most common mistakes of casting technology. Effect of which are:
- A. cast porosity.
- B. incomplete cast.
- C. little pearls on the surface of cast.
- D. dark color of cast.
- E. reverse porosity.
Hint
Ask what general defect results when air trapped in the investment or mould cannot escape during casting.
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