California Registered Dental Assistant (RDA) Written Practice Exam

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When portable equipment such as curing lights and nitrous oxide machines are used, in which zone of operation are they placed?

  1. Transfer zone

  2. Operator zone

  3. Assistants zone

  4. Static zone

The correct answer is: Static zone

Portable equipment, such as curing lights and nitrous oxide machines, are typically placed in the static zone during dental procedures. This zone is designated for equipment that is not in direct contact with the patient, such as x-ray machines and hand-held devices. The transfer zone is used for items that are passed between the dental team members, the operator zone is for the dentist performing the procedure, and the assistants zone is for dental assistants to work closely with the operator. Therefore, options A, B, and C are incorrect as they do not accurately reflect the placement of portable equipment during dental procedures.

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