Dental instrument for tooth polishing and grinding etc.

摘要

The dental instrument has a tool (2) in a release mounting at a rotating shaft. The mounting has a central pin (3) at the shaft or the tool (2), and a central opening (4) at the tool (2) or the shaft. The pin (3) is inserted into the opening (4), which has dimensions only slightly larger than the pin. Both, the pin (3) and opening (4) have a polygonal cross-section with the same polygon shape. The pin (3) can rotate slightly within the opening (4), within the tight tolerances of the gripping polygon surfaces.