The restorative alloy and mercury compound that has proven durability and longevity is:
  1. Gold
  2. Silver
  3. Enamel
  4. Amalgam
Explanation
Answer: D - The restorative alloy and mercury compound that has proven durability and longevity is amalgam. It is used as a dental filling. Amalgam consists of silver, tin, copper, zinc, and mercury.
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