Investment material used for cobalt-chromium alloys is_____________?
Correct answer: B. Phosphate bonded
- A. Gypsum bonded
- B. Phosphate bonded
- C. Silica bonded
- D. None of the above
Explanation
Cobalt-chromium alloys melt at high temperatures, so gypsum-bonded investments cannot withstand casting temperatures reliably. Phosphate-bonded investments provide the required high-temperature stability and thermal expansion.
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