High speed dental drill with positive pressure air drive ...
1993-1-13 · It is an object of the present invention to provide an improved high speed dental drill in which positive air pressure is provided and maintained inside of the drill head so that the air used to power the turbine is positively exhausted, by the positive air pressure, toward the drilling tool so as to prevent contaminated blood from being drawn up into the drill head both during operation and during turning …
Get Price