| 摘要 |
A dental trephine drill cuts a bore having a central core. The drill includes a shank having a fluid passage for conducting drilling fluid and a cutting head disposed at a front end of the shank. The cutting head includes front and side faces. The end face surrounds a central hole and includes a plurality of end cutting edges extending from the hole to an outer periphery of the end face. The side face includes a plurality of longitudinal grooves, a longitudinal edge of which defines a side cutting edge. An aperture in each groove communicates the grooves with the interior of the head for conducting drilling fluid into the grooves to cool the drill head and bone tissue.
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