In what scenario would a dental assistant use the acorn burnisher?

The acorn burnisher is primarily used for polishing amalgam restorations. This instrument features a rounded end that allows it to smooth and shine the surface of the amalgam filling after it has been placed in the cavity. By using the acorn burnisher, the dental assistant can help achieve a more aesthetically pleasing and smooth surface, which is essential for both functional and cosmetic outcomes in dental restorations.

In contrast, the other options represent different functions within dental practice. Applying topical fluoride involves different applicators or brushes, taking X-rays requires specific radiographic equipment, and placing dental crowns involves various other instruments designed for crown preparation and fitting. The acorn burnisher’s specific design and purpose make it the ideal choice for refining the surfaces of amalgam restorations.