Question 210 (part 2) · LDEK · Prosthodontic materials
In order to ensure the integrity of metal coping during multiple firing of ceramics, it is required to absolutely maintain the difference in melting temperatures of alloy and ceramics. The alloy melting temperature is to be higher than the ceramics, and the difference between them is:
- A. 50-100oC.
- B. 100-150oC.
- C. 150-200oC.
- D. 200-250oC.
- E. 250-300oC.
Hint
The alloy must stay rigid and must not creep during repeated porcelain firings; the safety margin is well above 100 degrees.
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