Ball bearings used in dental highspeed handpieces reduce rotational friction to allow the spindle/chuck assembly in the turbine cartridge (and the bur, when inserted) to spin at speeds from 250,000 to 500,000 rpms. This makes the highspeed dental turbine one of the fastest rotating devices in the world.
The highspeed ball bearing is comprised of:
- Outer ring or outer race
- Inner ring or inner race
- Cage or retainer or separator
Common dental ball bearing designs
- Angular contact
- Radial or deep-groove