What is the primary function of a rheostat in dental equipment?

The primary function of a rheostat in dental equipment is to control handpiece speed. A rheostat is a type of variable resistor that allows for the adjustment of electrical resistance in a circuit. In the context of dental equipment, it specifically regulates the speed at which the dental handpiece operates. This is crucial for various dental procedures, as different tasks require varying levels of speed to ensure precision and control during dental work, such as drilling or polishing.

By manipulating the rheostat, dental professionals can fine-tune the handpiece speed according to the specific requirements of the procedure, which enhances patient comfort and improves the quality of the work done. This flexibility is essential for adapting to the needs of individual patients or different types of dental treatments.