Abutment, for dental interventions in assisted surgery, comprising: - a first element, comprising a lower cylindrical element and a semi-spherical element, that is integrally joined above said cylindrical element, wherein said first element is divided into a plurality of parts and said plurality of parts are held together by an outer element, wherein said semi-spherical element is provided with an internal thread, on which a centrally perforated screw is coupled with, wherein the transition zone between said lower cylindrical element and said semi-spherical element at the beginning of said internal thread is internally provided with a shoulder, wherein said lower cylindrical element has internally a plurality of steps or protrusions; and - a second element, comprising an upper cylindrical element and a lower semi-spherical element, wherein said upper cylindrical element is externally provided with a second plurality of steps or protrusions, said second plurality of steps corresponding to said first plurality of steps provided on the lower cylindrical element of said first element wherein said upper cylindrical element is dimensioned in such a way as to be coupled internally with the lower cylindrical element of said first element, wherein the first and second plurality of steps (8; 12) allow relative positioning of said first element with respect to said second element vertically along an axis Z, - a third semi-spherical element, divided into a plurality of parts, which are housed in the lower semi-spherical element of the second element, wherein said third semi-spherical element is terminating with means for coupling with a dental implant. - a first element, comprising a lower cylindrical element and a semi-spherical element, that is integrally joined above said cylindrical element, wherein said first element is divided into a plurality of parts and said plurality of parts are held together by an outer element, wherein said semi-spherical element is provided with an internal thread, on which a centrally perforated screw is coupled with, wherein the transition zone between said lower cylindrical element and said semi-spherical element at the beginning of said internal thread is internally provided with a shoulder, wherein said lower cylindrical element has internally a plurality of steps or protrusions; and wherein said first element is divided into a plurality of parts and said plurality of parts are held together by an outer element, wherein said semi-spherical element is provided with an internal thread, on which a centrally perforated screw is coupled with, wherein the transition zone between said lower cylindrical element and said semi-spherical element at the beginning of said internal thread is internally provided with a shoulder, wherein said lower cylindrical element has internally a plurality of steps or protrusions; and - a second element, comprising an upper cylindrical element and a lower semi-spherical element, wherein said upper cylindrical element is externally provided with a second plurality of steps or protrusions, said second plurality of steps corresponding to said first plurality of steps provided on the lower cylindrical element of said first element wherein said upper cylindrical element is dimensioned in such a way as to be coupled internally with the lower cylindrical element of said first element, wherein the first and second plurality of steps (8; 12) allow relative positioning of said first element with respect to said second element vertically along an axis Z, wherein said upper cylindrical element is externally provided with a second plurality of steps or protrusions, said second plurality of steps corresponding to said first plurality of steps provided on the lower cylindrical element of said first element wherein said upper cylindrical element is dimensioned in such a way as to be coupled internally with the lower cylindrical element of said first element, wherein the first and second plurality of steps (8; 12) allow relative positioning of said first element with respect to said second element vertically along an axis Z, - a third semi-spherical element, divided into a plurality of parts, which are housed in the lower semi-spherical element of the second element, wherein said third semi-spherical element is terminating with means for coupling with a dental implant.