DANB General Chairside Practice Test

What is the purpose of a sandpaper disc used in a low-speed handpiece?

1. Shapes a restoration

2. Polishes and/or finishes a restoration

3. Drills into enamel

4. Separates teeth

The correct answer is: Polishes and/or finishes a restoration

The correct answer indicates that the primary purpose of a sandpaper disc used in a low-speed handpiece is to polish and/or finish a restoration. Sandpaper discs are specifically designed to provide a smooth, polished surface on restorations such as composites or amalgams after they have been shaped and placed. By using these discs, dental professionals can refine the surface and enhance the aesthetic appearance of restorations, making them less rough and improving the overall function and appearance. Furthermore, this polishing action helps to minimize plaque accumulation and discoloration, contributing to long-term oral health. The use of sandpaper discs in this context is vital, as achieving a high shine can also help in reducing wear and tear over time. In contrast, while shaping a restoration is important, sandpaper discs are typically not the tools used for this purpose; rather, they are more suited for finishing. Drilling into enamel and separating teeth are distinct procedures that require different instruments and are not functions that sandpaper discs are intended to perform.