What factors should consider when buying dental handpieces

Dentist need to consider buying dental handpiece,need to consider following factors

The high-speed dental handpieces is activated by pressing a rheostat pedal located on the floor. This foot pedal also controls the speed of the handpiece, similar to the accelerator on a car.

Most models in use today employ compressed air to drive the turbines inside. The movement of the turbines creates the rotary action at the end of the handpiece. Drill bits, also known as burs, discs or stones depending on their function, are attached to the end of the handpiece and perform the cutting action on the tooth or other material.

The head, or working end, of the high-speed handpiece is where the burs and other cutting or polishing attachments are connected. Options for the head include standard size as well as pediatric size for small mouths.
Dental handpieces cutting generates significant friction heat, which can damage the nerve, so the head often features a built-in air, water or air-water spray that acts as an on-demand coolant. Many high-speed handpiece models also include a fiber-optic light source to help the dentist view the treatment area more easily.

The chuck is the part of the head that holds the burs and other handpiece attachments. There is a small hole in the chuck into which the attachments are inserted and removed from the handpiece.
With some handpiece models, a bur tool or wrench is used to insert or remove the attachments. Other models have a built-in button or lever on the back of the head, eliminating the need for a separate tool.

The shank, or handle, is located between the head and the connection end of the high-speed handpiece. The shank is often contra-angle dental (at an angle with) the head. This contra-angle provides improved accessibility and visibility during many types of operative dental procedures.