During a crown preparation, which type of instrument would be considered most appropriate for smoothing the prepared surface?

The finishing bur is designed specifically for smoothing and refining prepared surfaces in dental procedures, particularly after a crown preparation. This type of instrument has a finer grit compared to standard burs, allowing it to create a smooth surface that is essential for the proper seating and adhesion of crowns. Its fine cutting edges enable the dental assistant or dentist to achieve a polished finish, which is vital for the aesthetics and functionality of the crown restoration.

Other instruments, while useful in different contexts, do not serve this purpose as effectively. Excavators are primarily used for removing decayed tooth structure and debris rather than for smoothing surfaces. Standard burs are intended for cutting and shaping and, although they can create a rough surface, they are not suited for final finishing. Chisels are used for cutting enamel and dentin and are not typically used in the smoothing phase of a crown preparation. Thus, the finishing bur is the most appropriate choice for achieving a smooth finish on the prepared surface.