DENTAL SUPERSTRUCTURE, AND A METHOD OF MANUFACTURING THEREOF

1 . A dental superstructure comprising a screw-channel with a first mouth, through which screw-channel a screw member is to be inserted, and a screw member seat with a second mouth, for providing support to the head of said screw member during fixation of said dental superstructure to a spacer element or an implant through said second mouth, whereby a communication is obtained between said first mouth and said second mouth, wherein

at least one part of a central axis of said screw channel and a central axis of said second mouth do not coincide.

2 . The dental superstructure according to claim 1 , wherein said screw member seat is integrated with said dental superstructure.

3 . The dental superstructure according to claim 1 , wherein shoulders of said screw member seat has a declining shape.

4 . The dental superstructure according to claim 1 , wherein shoulders of said screw member seat has an arched or semi-spherical shape.

5 . The dental superstructure according to claim 1 , wherein said superstructure is manufactured of a material selected from titanium, zirconium oxide, alloys of titanium and zirconium.

6 . A method of manufacturing of a dental superstructure comprising a screw-channel with a first mouth, through which screw-channel a screw member is to be inserted, and a screw member seat with a second mouth, for providing support to the head of said screw member during fixation of said dental superstructure to a spacer element or an implant, whereby a communication is formed between said first mouth and said second mouth, wherein

drilling said communication such that at least one part of a central axis of said screw-channel and a central axis of said second mouth do not coincide.

7 . The method according to claim 6 , wherein said drilling comprises a drilling of a first straight bore from a first point, and a drilling of a second straight bore from a second point, such that said first bore and said second bore intersect in the interior of said superstructure to form said communication.

8 . The method according to claim 7 , wherein the drilling of said first bore and said second bore is done by a twist drill, whereby a diameter suitable for constituting the threaded part of a screw member is obtained.

9 . The method according to claim 7 , wherein said drilling comprises a drilling of a third bore using said first bore and said second bore as guides, said third bore being drilled by using a drill bit with a cutting surface of a sufficient diameter to create said screw-channel through which said screw member may be passed in order to attach said dental superstructure to said spacer element or said implant.

10 . A screw-member, comprising a threaded part and a screw-head with a recess for receiving a driving means, said screw-head comprising a surface, bearing, in use, on shoulders of a screw-member seat, wherein said surface is bevelled towards said threaded part.

11 . A screwdriver, comprising a rotatable handle portion and a flexible shaft portion, with a distal end coupled to said handle portion and a proximal end coupled to a tip for driving a screw member with rotation transmitted from said rotatable handle portion, wherein by said flexible shaft portion comprising a plurality of wires, said wires being twinned in a plurality of layers, such that said flexible shaft portion is formed between said distal end and said proximal end.

12 . A screwdriver according to claim 11 , wherein one part of said plurality of layers is twinned in one direction and another part of said plurality of layers is twinned in another direction.