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ePaper created 2016-01-07, 12:59:38 | version 1.38.0
I case report The master cast with abutment analogues and silicone gingiva was fabricated at the laboratory (Figs.5a&b)andthencheckedinthedentalofficeus- ing an index made of non-expanding stone in order to ensure absolute precision (Fig. 6). This step is es- sential to ensure that the master model is perfectly accurate.4 The maxillomandibular relationship is thentransferredtothearticulatorbyreliningtheex- istingprosthesisonconicalcapsofabutments(abite wax on a hard basis—a technique considered more accurate by some—can be used instead). The inter- pupillary line was registered by means of an incli- nometer (AmannGirrbach). The aesthetic set-up, maxillomandibular relationship and occlusion were then checked on the patient by means of a denture set-up placed on a thermoformed hard basis. This set-up reflected the patient’s wishes regarding aes- thetics too. The laboratory produced a resin pattern of the substructure (Fig. 7), namely a milled bar as a true anchoring beam, screwed on to the abutments. Af- ter approval, the master model and wax-up were sent to Simeda (Anthogyr). This fabrication centre scans the master model and virtually designs the component to be produced (Figs. 8a & b). After ap- proval of this virtual model at the laboratory by means of a 3-D PDF document (Figs. 9a & b), the bar wasmilledfromablockoftitanium,usingafive-axis CNC milling machine (Fig. 10).5 28 I implants4_2015 Figs. 5a & b_Master cast with silicone gingiva. Fig. 6_Plaster index for approval. Fig. 7_The wax pattern fabricated by the laboratory technician. Fig. 8a_Simeda scan. Fig. 8b_Scanning. Fig. 8a Fig. 8b Fig. 6 Fig. 7 Fig. 5a Fig. 5b