INBDE (Integrated National Board Dental Examination) Practice Exam

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In a gold casting alloy, which element is added primarily to act as a scavenger for oxygen during the casting process?

Copper
Palladium
Silver
Zinc

The correct answer is: Zinc

Zinc is added to gold casting alloys primarily as a scavenger for oxygen during the casting process. This is because zinc has a high affinity for oxygen, meaning it readily combines with oxygen to form oxides. This process helps remove any excess oxygen from the alloy, ensuring a better casting process and resulting in a higher quality final product. The other options, copper, palladium, and silver, are often used in gold alloys for different purposes. Copper is added to increase the strength and hardness of the alloy. Palladium is added to increase the durability and corrosion resistance of the gold. And silver is added to create a slightly different color in the alloy. While these elements may also help remove oxygen, they are not the primary element used for this purpose in gold casting alloys. Therefore, they are incorrect options for this question.