| 摘要 |
A dental handpiece for use with a device for treatment of teeth by a jet of an abrasive powder mixed with air and water has a first one-way valve in a first supply line for pressurised air connected to an integrated powder container of a gripping sleeve and at least a first filter is further provided in this first supply line at a position upstream of the first one-way valve and downstream of a connecting end where the supply line connects with a common supply for air and water which is provided at the rearward end of the gripping sleeve. A second filter is provided at a position downstream of the first one-way valve in the first supply line and a second one-way valve is provided in a second supply line for water together with a third filter. The first and third filters each have a fine-meshed screen body. The second filter has a microporous sintered metallic body or a microporous plastic body.
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