What distinctive feature does an acorn burnisher have compared to other dental instruments?

An acorn burnisher is characterized primarily by its round tip, which is essential for its function in dentistry. This rounded design allows the instrument to effectively smooth and polish dental materials, such as composite resins and amalgams, after they have been placed in a cavity preparation. The smooth, rounded end applies gentle pressure to burnish the surface, improving the overall finish and sealing of the material, which can contribute to the longevity and aesthetics of dental restorations.

The distinction of the acorn burnisher lies in its specific shape and function; while there are many dental instruments tailored for cutting or manipulating materials, the round tip set it apart as a tool dedicated to the burnishing process, ensuring that the materials achieve the desired surface quality without causing damage. Other features such as being double-ended or vibrating do not define this specific instrument, which further solidifies the importance of the round tip in its design and usage.