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Friday, March 16, 2001

91 MCQs in Prosthodontics Answers

Friday, March 16, 2001

The Correct option is D

  • Zinc is used in crown and bridge alloys primarily as an oxygen scavenger. Zinc readily combines with oxygen that may have dissolved in alloy when it was in a molten state. This prevents the oxygen from forming gas porosity in the casting.

  • In PFM formulations, zinc also lowers the melting range, increases strength and hardness, and raises the thermal expansion.

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