When Gold fused with porcelain is fired at very high temperature greenish discoloration of cervical margin is due to________________?
Correct answer: C. Presence of copper
- A. High firing temperature
- B. Disintegration of opaque layer
- C. Presence of copper
- D. Formation of excess oxides
Explanation
Copper in the gold alloy can oxidise during porcelain firing and produce a greenish cervical discoloration. The problem is therefore related to copper-containing alloy constituents rather than simply the firing temperature.
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