Micromotors in dentistry are low speed rotary devices. They are used for various purposes including removal of soft caries, finishing and polishing and the likes. Their speed ranges from 500 to 100,000 rpm. They exhibit low speeds and higher torque values. This is important to prevent the instrument from stalling during clinical procedures.
Micromotors can be of two types namely- air driven and electrically driven. The electrically driven versions are way more versatile than the air driven counterparts, and are more expensive. There are various coupling designs that connect the air turbines and micromotors to the adaptors present on the hoses of the instrument delivery units.