California Registered Dental Assistant (RDA) Written Practice Exam

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What type of cleaning machine is used to clean contaminated instruments prior to sterilization?

  1. Dishwasher

  2. Washing machine

  3. Ultrasonic

  4. Steam cleaner

The correct answer is: Ultrasonic

Ultrasonic cleaners use high frequency sound waves to create small bubbles that scrub and remove dirt, debris, and stains from contaminated instruments. Unlike dishwashers and washing machines, ultrasonic cleaners use specialized cleaning solutions and can reach small crevices and creases, making them more effective for cleaning medical instruments. Steam cleaners, while also effective for sterilization, do not have the same cleaning mechanism as ultrasonic cleaners.

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