| 摘要 |
A dental anchoring device for attaching to a dentist's drill bit comprises a threaded anchoring part, connected to a rod by a weakened waisted portion. The rod is carried by a main body of the dental anchoring device with a shaped axial blind bore for fitting the body onto the shank of the drill bit, having a bit end receivable in the blind bore. A tapered part of the shank of the drill bit and matching section of the bore are provided with respective flat faces to key the shank to the body. A locking groove keys the shank of the drill bit into the chuck of a dentists drill. In an alternative embodiment, a line of weakness is provided between a metal anchoring rod and a plastics body, which is severed when a limiting torque is exceeded, allowing the body to be withdrawn, and the rod to be left in situ.
|
