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ePaper created 2017-03-17, 11:21:45 | version 1.38.0
use of the magnification systems industry report | Fig. 21 Fig. 22 Fig. 23 Fig. 24 Fig. 25 Fig. 26 correct areas where to locate the attachments were carefully evaluated and the milling centre was asked to produce the threads inside the bar in order to screw the attachments directly into it after polish- ing and finishing; the most suitable attachments were then screwed to reach the retentiveness that was planned beforehand (Fig. 12). Once polished, the bar superstructure can be produced (Fig. 13). A crucial step is to refine and perfectly polish the areas around the implants and the soft tissues, be- cause the superstructure did not have to compress any area (Fig. 14). The superstructure may be made with an indirect technique duplicating the model, or with CAD, or directly on the structure with resin, as presented in this case report. Once done and be- fore the casting, a further control with the silicone keys of the volumes and spaces available (Fig. 15) was made. After the checks, the superstructure was sprued with injection pins and with a stabiliser bar in the rear area (Fig. 16). Immediately after the cast, the superstructure was controlled in all its parts to verify the quality of the alloy, and checked it fit over the bar with a marker spray and with minimal pressure (Figs. 17 & 18). With magnifier systems, every area of friction or incorrect pressure, both on the bar and in the superstructure, was searched; this allows the maximal function of Fig. 27 Fig. 28 Fig. 23: After checking the good friction of the superstructure all the retentive laboratory caps were placed, the bar and attachments sprayed anew with the marking spray and the correct sitting is checked. Figs. 24 & 25: After removing the superstructure, the retentive areas of the attachments are searched with the microscope; the wrong areas of contact on the attachments show how they do not work properly. This because there are some points on the structure that have to be discarded as they will interfere with the bar insertion. Fig. 26: After correcting of those points that interfere with the proper function of the attachments, the superstructure sits correctly over the bar and this is showed by the correct contact areas on the attachments. Fig. 27: After all these functional tests between the structure and superstructure, the available spaces are checked with the lingual silicone key. Fig. 28: Using the vestibular silicone key, the teeth were repositioned. Fig. 29: Having built the structure and the superstructure with the silicone keys, the teeth repositioning is easily done, having all the necessary space and without affecting the teeth. Fig. 30: Detail of the modeling Fig. 29 Fig. 30 of the soft tissues after the replacement of the teeth. CAD/CAM 1 2017 31