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ePaper created 2018-02-16, 11:17:41 | version 1.38.0
| case report maxilla restoration Fig. 6 lent aesthetic results, we infiltrated the frameworks with the special IPS e.max ZirCAD LT colouring liq- uids (Ivoclar Vivadent) before sintering. In the incisal and occlusal areas, the chroma was increased and the translucency was adapted in the appropriate areas. As only the buccal surfaces were veneered in this case, the framework volume was rel- atively solid. We always carry out a slow sintering procedure (9 h) in our laboratory for complex resto- rations, such as the reconstruction presented here. Subsequently, the surfaces of the monolithic zirco- nium dioxide parts were polished, paying special at- tention to the occlusal areas. For polishing, we used polishing cones from SHOFU or anaxdent. These cones guarantee thorough polishing so that the sur- face can subsequently be easily polished to a high lustre. We do not use silicone cones or discs, as they Fig. 7a Fig. 7b Fig. 6: The CAD/CAM-fabricated abutments (hybrid abutments) were screwed on to the implants. Figs. 7a & b: The CAD framework construction after the buccal areas had been cut back. (IPS e.max ZirCAD). The material used has inter- esting mechanical properties, which, among other qualities, guarantee the long-term stability of the restorations. The selected shade of LT sun offers a light chroma that matched perfectly the envisaged Shade A restorations. After milling the frameworks, we corrected the morphology slightly, paying par- ticular attention to the interdental areas. For excel- leave residues on the surface, making the application of glazing materials difficult. Areas that are difficult to access during polishing are covered with a thin glaze layer. This was followed by a restoration try-in in the patient’s mouth. The dentist checked the occlusion and function. Figs. 8a & b: Colouration of the zirconium dioxide before sintering. Fig. 8a 28 CAD/CAM 4 2017 Fig. 8b