| 摘要 |
The invention relates to a dental instrument, in particular a dentist's hand tool for precisely determining and setting the lengths of dental cutting tools. In one embodiment, a dentist's hand tool (10) is disclosed, having a mirror portion (12) and a handle (13). The handle (13) incorporates a well or socket (48) at its end remote from the mirror portion (12), which includes a threaded sleeve (18) which engages a threaded rod (14) of the handle (13). The length or depth of the well or socket (48) is adjusted by rotating the sleeve (18) until the well (48) is set at a desired depth, measured between an end face (31) of the rod (14) and an end (41) of the sleeve (18) using scales (28,44). A dental tool (50) then inserted into the well (48) can be set to a predetermined depth of operation and a depth stop (54) on the tool (50) adjusted to set this depth.
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