Dental sub-assembly for the individual prosthetic restoration of a tooth, shaped to be received on a dental implant, said dental sub-assembly being able to be assembled with a first element of core type on which stratification is performed or of ceramic core type, said dental sub-assembly including: - a second element with a second through-passage extending along a second longitudinal axis (II-II), including a bearing surface shaped to be able to receive in axial bearing abutment said first element and including a proximal end shaped to be able to come to bear axially against or shaped to be able to come to penetrate into said dental implant, - a first fastening screw including a first screw head from which there extends a first screw shank able to pass through the second element, being received in the second through-passage and having an externally-threaded section shaped to be received by screwing in said dental implant, the first screw head being sized so as to allow it to be received in said first element, - a ring shaped to form a seat for the first screw head and shaped to be mounted on and retained in said first element, characterized in that: - said second element includes at least one second rotation indexing member shaped to block rotation of said first element relative to the second element about the second longitudinal axis (II-II), and includes a third rotation indexing member, - the ring includes at least one fourth rotation indexing member, - the third rotation indexing member and the fourth rotation indexing member are shaped to interlock by axial inter-penetration along the second longitudinal axis (II-II) when the second element and the ring are in a penetration orientation relative to one another about the second longitudinal axis (II-II), so that in an interlocked position the third rotation indexing member and the fourth rotation indexing member block rotation of the ring relative to the second element about the second longitudinal axis (II-II). - a second element with a second through-passage extending along a second longitudinal axis (II-II), including a bearing surface shaped to be able to receive in axial bearing abutment said first element and including a proximal end shaped to be able to come to bear axially against or shaped to be able to come to penetrate into said dental implant, - a first fastening screw including a first screw head from which there extends a first screw shank able to pass through the second element, being received in the second through-passage and having an externally-threaded section shaped to be received by screwing in said dental implant, the first screw head being sized so as to allow it to be received in said first element, - a ring shaped to form a seat for the first screw head and shaped to be mounted on and retained in said first element, - said second element includes at least one second rotation indexing member shaped to block rotation of said first element relative to the second element about the second longitudinal axis (II-II), and includes a third rotation indexing member, - the ring includes at least one fourth rotation indexing member, - the third rotation indexing member and the fourth rotation indexing member are shaped to interlock by axial inter-penetration along the second longitudinal axis (II-II) when the second element and the ring are in a penetration orientation relative to one another about the second longitudinal axis (II-II), so that in an interlocked position the third rotation indexing member and the fourth rotation indexing member block rotation of the ring relative to the second element about the second longitudinal axis (II-II).