Anti-suck-back dental handpiece structure

The utility model discloses a dental handpiece structure capable of preventing back suction. Included are: a handle module, machine head shell module, gear power module, bearing module, the utility model discloses a machine needle and pressing shaft module. The method is characterized in that the method is characterized by comprising the following steps; the machine head shell module is provided with a step-shaped circular ring slot inside the end of the machine needle and pressing shaft module; a sealing piece is arranged in the step-shaped circular ring groove position, the sealing piece isof a rubber injection molding integrally-formed structure, the outer side of the sealing piece is arranged to be of a step-shaped circular ring structure matched with the step-shaped circular ring groove position, and the sealing piece is arranged on the machine needle and the pressing shaft module in a sleeving mode; according to the anti-back-suction dental handpiece head, the phenomenon of backsuction is almost avoided