Final answer:
The ability of RDAEFs to apply etchant for bonding restorative materials depends on regional regulations but is generally allowed under the supervision of a licensed dentist, provided they are properly trained and certified.
Step-by-step explanation:
The ability for Registered Dental Assistants in Extended Functions (RDAEFs) to apply etchant for bonding restorative materials is determined by regional dental board regulations and can vary from one jurisdiction to another. In some states, RDAEFs are permitted to apply etchants as part of the preparation for dental restorative procedures under the supervision of a licensed dentist. Etchant is a substance used to roughen the tooth surface at a microscopic level to improve the bonding of restorative materials, such as composite resins, to the tooth structure. The RDAEF must be properly trained and certified according to the local dental board's requirements to perform such tasks. It's important for dental professionals to stay informed about their scope of practice as it may change with new laws and regulations.