California Registered Dental Assistant (RDA) Written Practice Exam

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How are gypsum materials mixed for dental use?

  1. using an electric mixer

  2. using a spatula and rubber bowl

  3. pouring directly into the mold

  4. with a whisk and metal bowl

The correct answer is: using a spatula and rubber bowl

Gypsum materials are typically mixed for dental use using a spatula and rubber bowl. This is because using an electric mixer can cause air bubbles and reduce the strength of the final product. Pouring directly into the mold can also result in air bubbles and an uneven mix, leading to a weaker material. Using a whisk and metal bowl is not recommended as it can create clumps and uneven mixing. The most effective and commonly used method is using a spatula and rubber bowl for smooth and consistent mixing without introducing air bubbles.

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