ZERO SUCKBACK DEVICES FOR HIGH-SPEED TURBINE DENTAL DRILL HANDPIECE

摘要

Zero suckback devices for a high-speed turbine dental drill handpiece, mounted at two ends of a handpiece head body (1). The device, at one side of the handpiece head body (1) where a bur (3) is mounted, consists of an elastic shaft enclosure (17) with a center being embedded with a metal center skeleton and a non-elastic shaft enclosure (15), and the lip part of the elastic shaft enclosure (17) matches a rotor shaft with a tapered end part. The device, at one side of the handpiece head cover (2) of the handpiece head body, is provided with an O-shaped sealing ring (7) between a button cover body and the handpiece head cover body, and provided with a one-way ball valve at the center of the button cover body. Anti-suckback measures are taken at two sides of the handpiece head body (1), and therefore, a suckback material may be controlled to a state of extremely few or almost zero.