| 摘要 |
PURPOSE: Three-dimensional curve structure of a dental tool is provided to allow the tool to be turned in all directions without interference in lip portions by the curve part during diagnosis and/or operation of teeth. CONSTITUTION: The structure comprises a first curving part(31) bent by an angle to axis of a handle(10) of the tool from a first bending point(A); a second curving part bent by an angle to the axis from a second bending point(B) and not parallel to the first curving part(31); a third curving part(33) bent by an angle to the axis from a third bending point(C) and not parallel to the first and the second curving parts(31,32); and a fourth curving part(34) bent by an angle from a fourth bending point(D) in a direction getting close to the axis and not parallel to an elongated part(30), the first, the second and the third curving parts(31,32,33).
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