Dental Assistant Practice Exam

A slow-speed handpiece operates within which RPM range?

1. 40,000-60,000 RPM

2. 10,000-30,000 RPM

3. 70,000-90,000 RPM

4. 30,000-50,000 RPM

The correct answer is: 10,000-30,000 RPM

The correct answer, which refers to the RPM range for a slow-speed handpiece, is understood to be 10,000-30,000 RPM. Slow-speed handpieces are specifically designed for procedures that require more control and precision, such as polishing teeth and removing decay from cavities. The lower RPM allows for better tactile feedback and minimizes the risk of damage to tooth structures, making it ideal for delicate applications in dental procedures. In contrast, other ranges like 40,000-60,000 RPM or 70,000-90,000 RPM pertain to high-speed handpieces, which are intended for cutting through harder materials and are typically used in cavity preparation and reducing tooth structure due to their higher rotational speed. Hence, knowing the correct RPM range for slow-speed handpieces is essential for proper instrument selection based on the clinical procedure being performed.