Cutting insert for tooth cutters

A cutting insert having a substantially cuboid basic body, which has two top surfaces on sides opposite each other and four substantially planar flank surfaces which extend in each case from an edge portion of the one top surface to an edge portion of the other top surface,

• wherein a cutting edge is formed at an intersection with each substantially planar flank surface and at least one of the top surfaces, and
• wherein a passage opening extends from the one top surface to the other top surface, and the top surfaces have a planar supporting portion with an inner periphery and an outer periphery, the inner periphery surrounds the passage opening and a non-planar surface portion corresponding to a surface of a truncated cone that extends radially outward from the outer periphery of the planar supporting portion to each cutting edge, and wherein the center axis of the truncated cone coincides with the center axis A of the passage opening and the non-planar surface portion is continuous in the circumferential direction with reference to the center axis of the cone, and
• wherein the non-planar surface portion descends toward an associated cutting edge such that the associated cutting edge is curved.