A mounting element for positioning an unworked dental prosthesis on a jig , wherein the mounting element being formed using 3D printing is configured for fixedly engaging the prosthesis , wherein the prosthesis being formed using 3D printing includes at least one unworked/unmachined bridge, the mounting element having an axis of elongation and comprises: an engagement portion , configured for fixedly engaging the prosthesis ; a registration portion configured for aligning, in use, the prosthesis in a precise position and/or orientation on the jig during machining; and an attachment portion , configured for enabling secure attachment of the prosthesis on the jig during said machining; wherein the registration portion comprises a tapering portion having a conically tapering outer surface ; wherein the mounting element further includes an open attachment recess , for example having a T-shaped axial cross section; wherein said attachment recess includes a transversely extending upper recess portion , for example corresponding to the upper part of the "T", the upper recess portion being configured to receive, in use, an upper portion of a fixing element, for fixedly attaching the prosthesis on the jig ; wherein said upper recess portion includes sidewalls extending parallel to the axis of elongation, the sidewalls being configured for guiding, in use, the upper portion of the fixing element into the upper recess portion ; wherein said upper recess portion includes endwalls in planes parallel to the axis , the endwalls being configured for receiving, in use, a correspondingly-shaped part of the upper portion of the fixing element into the upper recess portion ; and wherein the endwalls are disposed on a side of the sidewalls opposite to an opening of the recess. an engagement portion , configured for fixedly engaging the prosthesis ; a registration portion configured for aligning, in use, the prosthesis in a precise position and/or orientation on the jig during machining; and an attachment portion , configured for enabling secure attachment of the prosthesis on the jig during said machining; wherein the registration portion comprises a tapering portion having a conically tapering outer surface ; wherein the mounting element further includes an open attachment recess , for example having a T-shaped axial cross section; wherein said attachment recess includes a transversely extending upper recess portion , for example corresponding to the upper part of the "T", the upper recess portion being configured to receive, in use, an upper portion of a fixing element, for fixedly attaching the prosthesis on the jig ; wherein said upper recess portion includes sidewalls extending parallel to the axis of elongation, the sidewalls being configured for guiding, in use, the upper portion of the fixing element into the upper recess portion ; wherein said upper recess portion includes endwalls in planes parallel to the axis , the endwalls being configured for receiving, in use, a correspondingly-shaped part of the upper portion of the fixing element into the upper recess portion ; and wherein the endwalls are disposed on a side of the sidewalls opposite to an opening of the recess. <EOS>