California Registered Dental Assistant (RDA) Written Practice Exam

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What is the proper method for decontaminating impressions before sending them to the laboratory?

  1. Only rinse with water

  2. Sterilize using autoclave

  3. Clean and disinfect

  4. Dry and package

The correct answer is: Clean and disinfect

Cleaning and disinfecting is the proper method for decontaminating impressions before sending them to the laboratory. Rinsing with only water may remove some debris, but it is not enough to fully decontaminate the impressions. Sterilizing using an autoclave is unnecessary and may even damage the impressions. Drying and packaging without prior cleaning and disinfecting can also cause contamination. Therefore, the most effective and appropriate method is to clean and disinfect the impressions before sending them to the laboratory.

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