Dental Assistant Practice Exam

What is the maximum speed of a high-speed handpiece?

1. 100,000 RPM

2. 450,000 RPM

3. 300,000 RPM

4. 200,000 RPM

The correct answer is: 450,000 RPM

The maximum speed of a high-speed handpiece is typically around 450,000 revolutions per minute (RPM). High-speed handpieces are designed to provide optimal performance for various dental procedures, especially for cutting hard tooth structure, such as enamel and dentin. The high speed allows for efficient removal of tissue during procedures like cavity preparations and reduces the time required for drilling, which can enhance patient comfort. This speed capability is essential for achieving effective cutting and provides the necessary power to work with various burrs and cutting instruments. Handpieces that operate at lower speeds, such as 100,000 RPM, 200,000 RPM, or 300,000 RPM, are usually categorized as low-speed or medium-speed handpieces, which are used for different purposes, such as polishing or finishing rather than cutting hard tissues. The distinction between high-speed and other types of handpieces is critical in dental practice, as each serves specific functions and applications in patient care.