| 摘要 |
A dental hand piece is provided for use in conjunction with a source of pressurized water, a source of pressurized gas and a source of abrasive material. The hand piece includes an elongated body having a proximal end and a distal end. An internal mixing chamber is formed within the body and this mixing chamber is fluidly connected to a first outlet port at the distal end of the body by a first passageway. The source of pressurized water is fluidly connected to the mixing chamber by a second fluid passageway formed in the body while the pressurized gas source is fluidly connected by a third fluid passageway in the body to the mixing chamber. A fourth fluid passageway in the body fluidly connects the source of abrasive material to a second port formed at the distal end of the body. The first and second fluid ports are oriented so that the affluent from the first and second ports intersect each other at a predetermined distance from the distal end of the body.
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