Beyes Dental S20A Straight Nose Cones — 1:1 · S20A-NS · Non-Spray, Non-Optic

• High-Speed Handpieces — The fast one, for cutting: the bur is spun in the head of the handpiece, by an air turbine or an electric micromotor.
• Handpieces & Motors — The handpiece and its drive described as one device, rather than a head on its own.
• Hygiene & Prophy Handpieces — Slow, and for cleaning and polishing rather than cutting; the paste it carries is a separate device, applied to the teeth by a handpiece attachment.
• Endodontic Handpieces & Devices — Made for the root canal rather than the crown of the tooth, with the torque and speed of the motor controlled; a review describes the maker's settings as maximum limits rather than targets.
• Lab Handpieces & Micromotors — A micromotor with its own control box, rather than a handpiece that runs off the chair unit.
• Handpiece Parts Accessories & Maintenance — The heads, sheaths, grips and care products that go with a handpiece, not the handpiece itself.

Drive: air-driven handpieces, both low-speed and high-speed, have internal components that can be contaminated with patient material during use.

Connection: a handpiece that can be removed from the air and waterlines of the unit is cleaned and heat sterilized between patients. A cordless handpiece is independent of those lines, and for those the CDC points to current FDA regulations and the maker's validated reprocessing instructions.

Reprocessing: if a handpiece cannot be heat sterilized and has no FDA clearance with validated reprocessing instructions, the CDC says it should not be used. Neither surface disinfection nor immersion in germicides counts as reprocessing.

Coolant: the heat reaching the pulp depends on load, bur wear, the dentine left under the cavity and coolant flow, and reported rises without adequate coolant run from 3 °C to more than 15 °C.

Waterline: the tubes that feed high-speed handpieces can grow biofilm, and microorganisms can also enter the line from the mouth during treatment. The measures named against that are anti-retraction valves and flushing each device that enters the mouth for at least 20 seconds between patients.