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ePaper created 2015-05-14, 11:05:01 | version 1.38.0
I case report _ upper jaw rehabilitation pression transfers, but this technique could not be used here because of limited mouth opening. The master cast with abutment analogues and silicone gingiva was fabricated at the laboratory (Figs.5a&b)andthencheckedinthedentalofficeus- inganindexmadeofnon-expandingstoneinorderto ensureabsoluteprecision(Fig.6).Thisstepisessential toensurethatthemastermodelisperfectlyaccurate.4 The maxillomandibular relationship is then trans- ferred to the articulator by relining the existing pros- thesis on conical caps of abutments (a bite wax on a hard basis—a technique considered more accurate bysome—canbeusedinstead).Theinterpupillaryline wasregisteredbymeansofaninclinometer(Amann- Girrbach). 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 aesthetics 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. After 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 approval of this virtualmodelatthelaboratorybymeansofa3-DPDF document(Figs.9a&b),thebarwasmilledfromablock 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. 28 I CAD/CAM 2_2015 Fig. 8a Fig. 8b Fig. 6 Fig. 7 Fig. 5a Fig. 5b