Here's a breakdown:
* Bur: A small, rotating cutting instrument used in dentistry.
* Shank: The cylindrical portion of the bur that connects to the handpiece.
* Handpiece: The device that holds and rotates the bur.
* Chuck: The part of the handpiece that clamps onto the shank.
The shank has a specific shape and size that corresponds to the chuck of the handpiece. There are different shank types, such as friction grip and latch type, which determine how they fit into the chuck.