What are high-speed handpieces primarily used for?

High-speed handpieces are primarily used for cutting tooth structures, including those affected by decay or other dental anomalies. These instruments are designed to operate at high rotational speeds, which allows dentists to efficiently remove decayed materials and shape the tooth for restorations such as crowns, fillings, or bridges. Their capability to cut through enamel and dentin with precision makes them essential for various restorative and surgical procedures in dentistry.

While other options mention important functions related to dental care, they do not capture the primary purpose of high-speed handpieces. Polishing restorations and smoothing rough surfaces are typically tasks associated with lower-speed handpieces or specialized instruments rather than high-speed ones. Additionally, routine cleaning is related to maintenance procedures rather than the cutting action that high-speed handpieces are specifically designed to perform.