The gold alloys used for casting contain at least.... percent of precious metal according to ADA specification number 5________________?
Correct answer: C. 75
- A. 55
- B. 65
- C. 75
- D. 85
Explanation
Under ADA Specification No. 5, dental gold casting alloys contain at least 75% gold plus platinum-group metals. This precious-metal requirement distinguishes them from lower-noble-metal casting alloys.
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