| 摘要 |
<p>The implant (1) comprises a cylindrical shaft with a smooth head (2) ending in a threaded rod (3), with a nominal diameter equal to the diameter of the head (2). The head includes a hollow mould (4) with a flat bottom forming a radial bearing, and lateral surfaces set parallel to the axis. The cross section of the mould (4) consists of eight segments, each spanning a 45° angular sector centred on the shaft axis. The segments are alternately chords (such as 41) and arcs (such as 45, 46) of a circumscribed circle. The mould (4) is extended by an axial threaded blind channel (5). The mould (4) is designed to receive, without rotational play, a complementary cusp of a prothetic tooth structure obtained by replicating a model made from a calcinable material. The form of the mould chosen provides for an improved resistance to the walls of the mould and cusp and for the rectification of the flat faces of the cusp's structure, with reference to the circumscribed cylinder.</p> |
