A multi-unit abutment for alignment and attachment of a dental prosthesis to an implant with a prosthetic screw, wherein the prosthetic screw (6, 43) comprises a head and a threaded shaft, the multi-unit abutment comprising: an abutment base (1, 30, 52, 56) having a longitudinal axis, the abutment base (1, 30, 52, 56) comprising: a proximal end comprising a ball portion (13, 31) and an abutment base drive interface (10, 45, 60); and a distal end comprising screw threads for attachment to the implant; a swivel shell (2, 3, 32) having an inner surface and an outer surface, wherein the swivel shell (2, 3, 32) includes a swivel aperture proximate a distal end thereof and a threaded aperture (20, 75) at a proximal end thereof; and a lock screw (4, 33, 49) having a longitudinal axis, wherein the lock screw comprises: a portion with external threads (9, 39) compatible with the threaded aperture (20, 75) of the swivel shell (2, 3, 32); and a portion with internal threads (7, 36) sized to engage the prosthetic screw shaft; and a lock screw drive interface (8, 37, 54) being a through socket for receiving a lock screw drive tool (17, 18, 67, 71), and wherein the lock screw drive tool (17, 18, 67, 71) has a longitudinal axis and a maximum width that is less than the maximum width of the threaded shaft of the prosthetic screw (6, 43); and a Ti base, wherein the Ti base has an aperture on the proximal end that is larger than the prosthetic screw threaded shaft and smaller than the prosthetic screw head and a distal end that is shaped to be supported by the swivel shell (2, 3, 32) in a known orientation, and wherein the lock screw drive tool (18, 71) is sized to pass through the aperture of the Ti base without interference, wherein rotating the lock screw (4, 33, 49) is capable of fixing an orientation of the longitudinal axis of the lock screw (4, 33, 49) in an orientation that is not parallel to the longitudinal axis of the abutment base (1, 30). an abutment base (1, 30, 52, 56) having a longitudinal axis, the abutment base (1, 30, 52, 56) comprising: a proximal end comprising a ball portion (13, 31) and an abutment base drive interface (10, 45, 60); and a distal end comprising screw threads for attachment to the implant; a proximal end comprising a ball portion (13, 31) and an abutment base drive interface (10, 45, 60); and a distal end comprising screw threads for attachment to the implant; a swivel shell (2, 3, 32) having an inner surface and an outer surface, wherein the swivel shell (2, 3, 32) includes a swivel aperture proximate a distal end thereof and a threaded aperture (20, 75) at a proximal end thereof; and a lock screw (4, 33, 49) having a longitudinal axis, wherein the lock screw comprises: a portion with external threads (9, 39) compatible with the threaded aperture (20, 75) of the swivel shell (2, 3, 32); and a portion with internal threads (7, 36) sized to engage the prosthetic screw shaft; and a lock screw drive interface (8, 37, 54) being a through socket for receiving a lock screw drive tool (17, 18, 67, 71), and wherein the lock screw drive tool (17, 18, 67, 71) has a longitudinal axis and a maximum width that is less than the maximum width of the threaded shaft of the prosthetic screw (6, 43); and a portion with external threads (9, 39) compatible with the threaded aperture (20, 75) of the swivel shell (2, 3, 32); and a portion with internal threads (7, 36) sized to engage the prosthetic screw shaft; and a lock screw drive interface (8, 37, 54) being a through socket for receiving a lock screw drive tool (17, 18, 67, 71), and wherein the lock screw drive tool (17, 18, 67, 71) has a longitudinal axis and a maximum width that is less than the maximum width of the threaded shaft of the prosthetic screw (6, 43); and a Ti base, wherein the Ti base has an aperture on the proximal end that is larger than the prosthetic screw threaded shaft and smaller than the prosthetic screw head and a distal end that is shaped to be supported by the swivel shell (2, 3, 32) in a known orientation, and wherein the lock screw drive tool (18, 71) is sized to pass through the aperture of the Ti base without interference, wherein rotating the lock screw (4, 33, 49) is capable of fixing an orientation of the longitudinal axis of the lock screw (4, 33, 49) in an orientation that is not parallel to the longitudinal axis of the abutment base (1, 30).