Abstract: A high-speed turbine dental drill handpiece has a drilling needle, a wind wheel axle, a head housing having an annular opening with a two-step profile shape, and a suckback prevention device. The suckback prevention device includes an elastic bowl-shaped axle shroud coupled to an annular skeleton that are buckled in an inner step of the head housing and an annular screw connected to the outer step of the head housing (or retaining of the elastic bowl-shaped axle shroud. An eyelet for the drilling needle is set at the center of the elastic bowl-shaped axle shroud, the diameter of the eyelet being slightly larger than that of the drilling needle.

Abstract: A single use high-speed turbine dental drill handpiece, comprising: a head (1), a drilling needle (2), a front handle (3), a back handle (4), and a quick disconnect water and air adapter (13). The front end of the back handle (4) is connected with the front handle (3), the back end is connected with the quick disconnect water and air adapter (13). The back handle (4) has a solid monolithic structure with an inner through channel and is made of engineering plastics formed by single stage moulding. A water pipe passage (41) is set at the axle center of the front portion of the back handle (4), an air pipe passage (42) and an air return passage (43) are set at the eccentric position along the axial direction. An air pipe (5) and a water pipe (6) from the head (1) are inserted into the air pipe passage (42) and the water pipe passage (41), respectively, the clearance space is sealed by a sealing ring.

Abstract: A suckback prevention device for single use high-speed turbine dental drill handpiece, installed at the side assembled with the drilling needle of the head housing of the high-speed turbine dental drill handpiece which comprises a head, a drilling needle (3), a front handle (1), and a back handle (2). A powered wind wheel (7) and a wind wheel axle (15) driving the rotation of the drilling needle (3) are installed in the clearance space between the head housing (4) and the head cover (8). The wind wheel axle (15) is supported by the bearing (6). An O-shaped vibration reduction ring is disposed between the bearing (6) and the head housing (4). The upper end of the wind wheel axle (15) is connected orderly to the button cap spring (10) and the button cap (9). A water passage (19), an air passage (20), and a driving wind wheel air passage (12) are set at the neck portion of the head. The compressed air inlet (11) of the driving wind wheel is located in the powered wind wheel (7).