California Registered Dental Assistant (RDA) Written Practice Exam

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What tray type is most commonly selected when using zinc oxide-eugenol (ZOE) bite registration paste?

  1. Metal tray

  2. Custom tray

  3. Gauze tray

  4. Stock tray

The correct answer is: Gauze tray

Gauze tray is the most commonly used tray type when working with zinc oxide-eugenol (ZOE) bite registration paste. This is because ZOE paste is a flexible, putty-like material that needs a flexible tray to adequately capture the patient's bite. Metal trays are rigid and could cause the paste to distort, while custom trays can be expensive and time-consuming to make. Gauze trays are inexpensive and easily available, making them the most popular choice. Stock trays, on the other hand, are designed for general use and may not have the proper shape or size needed for an accurate bite registration.

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