| 摘要 |
<p>An arrangement usable as a core for a dental prosthesis or as a transfer jig in forming a model of an alveolar arch with one or more implants (24), comprising a nut (36) which is for fitting in a hexagonal portion of a socket (30) in the implant (24), a ring (35) for fitting over the nut (36) and seating around the mouth of the socket (30), and a post (37) for screwing through the nut (36) and the ring (35) to the implant (24). The ring (35) also has a hexonal bore portion which receives part of the nut (36). Thus the ring (35) is located spatially and angularly relative to the implant (24) without being socketted therein. When a dental impression has been formed with a plurality of the rings (35) embedded therein, or when a sub-frame for a bridge has been made up on two or more such rings (35) on a model of the alveolar arch made from that impression, it is removed by first unscrewing the post (37) and withdrawing it and the nut (36). Thus the impression or bridge sub-frame is easily removed despite the probability that the axes of the implants (24) in the alveolar arch are not parallel.</p> |
