California Registered Dental Assistant (RDA) Written Practice Exam

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What piece of lab equipment is used to grind away plaster or stone?

  1. Polisher

  2. Articulator

  3. Model trimmer

  4. Vacuum former

The correct answer is: Model trimmer

A polisher is not used for grinding away plaster or stone, but rather for making the material smooth and shiny. An articulator is used to hold models of teeth, not for grinding away materials. A vacuum former is used to create custom trays or splints, not for grinding away materials.

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