California Registered Dental Assistant (RDA) Written Practice Exam

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To extend an impression tray, what type of wax is used?

Boxing wax
Rope/ utility wax
Sticky wax
Baseplate wax

The correct answer is: Rope/ utility wax

Rope/utility wax is used to extend impression trays as it is the most flexible and moldable type of wax among the given options. Boxing wax is used for boxing or creating a border around the impression material, while sticky wax is used for attaching or joining parts of the impression tray. Baseplate wax is primarily used for bite registration. These options are not suitable for extending impression trays as they are not as easily shapeable and may affect the accuracy of the impression.