Percentage of gold in high noble alloy is
**Core Concept**
A high noble alloy, typically used for dental restorations, is a mixture of metals that is resistant to corrosion and wear. The gold content in these alloys plays a crucial role in determining their mechanical properties and biocompatibility.
**Why the Correct Answer is Right**
The correct answer is related to the composition of high noble alloys, which are designed to have a high gold content. Gold is added to these alloys to improve their mechanical strength, corrosion resistance, and biocompatibility. The gold content in high noble alloys is typically above 60%, with some alloys containing up to 75% gold. This high gold content helps to reduce the wear and tear on the alloy, making it more suitable for dental restorations.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the gold content in high noble alloys. High noble alloys typically contain more than 60% gold.
**Option B:** This option is incorrect because it suggests a lower gold content than is typically found in high noble alloys. Alloys with lower gold content are often classified as semi-noble or base metal alloys.
**Option C:** This option is incorrect because it does not provide a specific percentage of gold, making it impossible to determine whether it is correct or not.
**Clinical Pearl / High-Yield Fact**
When selecting a dental restoration material, it is essential to consider the gold content in the alloy. High noble alloys with a high gold content are generally more resistant to corrosion and wear, making them a popular choice for dental restorations.
**Correct Answer: C. 75%**