Patent ID: 7011521

Claim:
A dental handpiece for use with a device for treatment of teeth by means of a jet of an abrasive powder mixed with air and water, comprising: a gripping sleeve having an integrated powder container for storing a predetermined amount of powder; a first supply line for pressurised air connected to the powder container; a transfer line for powder mixed with air connecting the powder container with a multiple nozzle arrangement at a forward spray head of the gripping sleeve; a second supply line for water connected to the multiple nozzle arrangement; and a first one-way valve means in the first supply line at a position upstream of its delivery end which is connected to the powder container and downstream of its connecting end to a common supply means for air and water which is provided at the rearward end of the gripping sleeve; at least a first filter means provided in the handpiece in the first supply line for pressurised air, at a position upstream of the first one-way valve means and downstream of its connecting end to the common supply means for air and water.