California Registered Dental Assistant (RDA) Written Practice Exam

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Which material allows the longest working time when constructing a custom impression tray?

  1. Light-cured acrylic resin

  2. Polyvinyl siloxane

  3. Alginates

  4. Zinc oxide eugenol

The correct answer is: Light-cured acrylic resin

Light-cured acrylic resin provides the longest working time when constructing a custom impression tray. This is because it requires exposure to a light source for polymerization, which can be controlled by the dentist or dental assistant. In comparison, polyvinyl siloxane and alginates both have a relatively short working time as they begin to set immediately after mixing. Zinc oxide eugenol also has a fast setting time and is not suitable for constructing custom impression trays due to its rigidity and difficulty in removal from the mouth once set. Therefore, light-cured acrylic resin is the most suitable material for creating custom impression trays due to its extended working time and ease of manipulation.

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