Which of the following can be conducted by a dental hygienist with an initial limited license?

The ability of a dental hygienist with an initial limited license to perform oral prophylaxis and removal of deposits aligns with the scope of practice defined for dental hygiene in Washington State. A limited license allows dental hygienists to perform a range of tasks that are foundational to dental care, including preventative services like cleanings and scaling. These procedures are essential for maintaining oral health and can be performed under the supervision of a dentist.

In contrast, fitting dental crowns, developing treatment plans, and performing dental implants typically fall outside the scope of practice for dental hygienists, especially those with a limited license. Fitting crowns requires advanced training and is generally overseen by a dentist, while developing treatment plans often involves a broader clinical judgment that includes diagnosis, which is within the dentist's purview. Dental implants require specialized surgical skills and training that go beyond the educational background and permissible practice of dental hygienists, even those fully licensed. Therefore, the option of conducting oral prophylaxis and removal of deposits is the correct answer, as it is within the legal parameters for dental hygienists with an initial limited license in Washington State.