Which of the following is NOT listed as an authorized function an RDA can perform?

• A. Take final impressions
• B. Assist during procedures
• C. Coronal polishing
• D. Sealants

Answer: (B)

The key idea here is understanding the specific tasks that Iowa regulations explicitly list as functions an RDA may perform. The authorized functions are concrete, hands‑on duties like taking final impressions, coronal polishing, and applying sealants. “Assist during procedures” describes the general supportive role of a dental assistant rather than a distinct, named procedure in the RDA scope. Because it isn’t one of the enumerated functions, it isn’t listed as an authorized function for an RDA. In practice, RDAs may assist chairside under supervision, but the exam focuses on the explicit tasks that are officially authorized, and that option isn’t among them.