Channel formation for the fixing element of a dental superstructure. The superstructure (1) is fixed to the implantation (3) integrated in the jaw bone by means of a fixing element (2). A channel (7) is formed in the superstructure (1). The axis line (8) of the channel (7) is shaped to follow an arc (9) whose radii pointing to given points of the axis line (8) diverge from the plane of the arc (9) by 0-5%. The channel (7) is shaped in such a manner that the sections determined by the planes perpendicular to its axis line (8) are circles with the same diameter with their centres on the axis line (8). In the method according to the invention a computer controlled device is used for forming the channel.
