| 摘要 |
A dental syringe connectable to sources of air and water under pressure for selectively providing a solid stream of water, a spray of water and air or a jet of air is described. An adjustable nozzle capable of varying the diameter of the stream of water without change in the water pressure at the orifice of the nozzle is disclosed. The syringe includes a valve for controlling the stream of water, which valve provides a "pull-back" action with respect to the water at the orifice of the syringe when the water flow is interrupted.
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