| 摘要 |
According to the invention, there is provided an elongated liquid-cooled dental bur having a long direction, a proximal part adapted to be inserted into a drive device connected with a source of cooling fluid, a distal part having a cutting tip, a first channel in the proximal part fluidly communicating with the source of cooling fluid and at least one orifice extending from the first channel directed at the cutting tip for directing a spray of cooling liquid at the cutting tip, and further including a collar radially extending from the proximal part having a circumference, wherein the orifice is disposed in the collar proximal to the circumference, and wherein the collar has an end surface disposed transversely to the long direction facing the distal part, and the orifice is disposed in the end surface. The distal part is preferably removably secured to the collar, for removal and replacement of worn cutting tips. The distal part preferably fits into an axial bore in the collar and is secured in the axial bore with a set screw. The cutting tip may be substantially spherically shaped.
|
