| 摘要 |
PROBLEM TO BE SOLVED: To provide a dental handpiece by which flow rate of powder sprayed can be stabilized with increased retainability for a long time even while enhancing cutting efficiency. SOLUTION: A pair of two nozzles 37 are provided along the inner circumferential surface 21a of a concavity 21, air is blown out in a space from a blowout hole 37a provided at a tip end portion of the nozzle from a side where the nozzle 37 is provided to be directed to an opposite side along the inner circumferential surface of the space and the powder contained in the concavity 21 is blown up in the space, whereby the condition of the powder mixed with the air within the space is improved. Further, the powder near the surface of the accumulated powder of the concavity 21 is blown up by the air blown out from the blowout hole formed in the side face of the nozzle 37 in the case where the amount of the powder contained in the concavity 21 is large. Furthermore, the powder is blown up from the bottom portion 21c in the concavity 21 by the air blown out from the blowout hole formed in the side face of the nozzle 37 in the case where the residual amount of the powder in the concavity 21 is reduced. COPYRIGHT: (C)2009,JPO&INPIT
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