The invention relates to a dental handpiece for the rotational driving of a rotary dental tool (20), with: a housing (10) which has a handle (12) and a clamping chuck (14) for receiving the dental tool (20), a turbine which can be driven by means of compressed gas and which has a turbine wheel (16) and a rotor shaft (18), wherein the rotor shaft (18) is connected to the clamping chuck (14) in order to drive the clamping chuck (14) in rotation, at least one ball bearing (30) with balls (31), inner ring (32), outer ring (34) and ball bearing cage (33) which supports the rotor shaft (18) in rotation, wherein the inner ring (32) of the ball bearing (30) is arranged on the rotor shaft (18) and the outer ring (34) of the ball bearing (30) is mounted in the housing (10) via an elastic element (40) in order to damp vibrations, wherein the outer ring (34) and the inner ring (32) each have a raceway (L) for guiding the balls (31), wherein the raceway (L) of the inner ring (32), seen in cross section, has a concave shape with a constant curvature, of which the radius corresponds substantially to the radius of the balls (31), wherein the raceway (L) of the outer ring (34), likewise seen in cross section, has, in a central area, a first curvature (35) with a first radius (r0) and, in at least one area adjoining the central area, a second curvature (36) with a second radius (r1), wherein the first radius (r0) is smaller than the second radius (r1), or the raceway (L) of the outer ring (34), seen in cross section, has a substantially parabolic profile.
