Patent ID: 8672679

Claim:
A dental tool comprising: a shaft rotatable about a rotational axis; a working head attached to the shaft and also rotatable about the rotational axis, the working head including: a first toothing having a plurality of cutting edges formed around a complete periphery of the working head; a second toothing having a plurality of cutting edges formed in addition to the first toothing at sector partial regions of the working head thereby forming first sector regions containing the first toothing and absent the second toothing, and second sector regions containing both the first toothing and the second toothing in an overlapping manner; and the cutting edges of at least one chosen from the first and second toothing ending alternatingly in a circumferential direction in sector regions at a front face of the working head; wherein the working head is divided into two of the first sector regions and two of the second sector regions with each of the first and second sector regions having an angular range of approximately 90° and with the first sector regions and the second sector regions alternating with one another around a circumference of the working head; wherein the first toothing and the second toothing twist around the working head and the first toothing has a different angle of twist than the second toothing.