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12 CASE STUDY Fig. 17: At the start of the definitive restoration, there was a stable and precisely shaped gingival situation. Fig. 18: Individualized impression posts were produced for transferring the shape of the contoured soft tissue situation. The temporaries were screwed onto the lab analogs for this purpose. Fig. 19: The lab analogs were fixated in a silicone index and subgingival parts of the temporaries were prepared. Fig. 23: Impression-taking with polyester with the aid of an individual tray. Fig. 24: A removable gingival mask reproduces the emer- gence profile perfectly shaped intraorally. Fig. 25: The CAMLOG ® Titanium bonding base CAD/CAM was imported from the library and the emergence profile and the previously waxed crown were scanned with a double scan. model. The emergence profile transferred precisely from the mouth is then scanned using the double scan method and then the waxed anatomical crown shape is scanned. The abutment was then designed on the basis of this information and implemented in zirconium dioxide (Fig. 25 – 28) . The zirconium dioxide abutment was then conditioned, bonded and processed with the Multilink implant from Ivoclar. In order to ensure that the emergence profile and preparation margins are configured such that they present no problems from either an esthetic or attachment perspective, the finished abutment is tried out in the mouth (Fig. 29) . Investigations from Agar et al. [1], as well as from Weibrich and El-Nawas [19] and Wilson [20], clearly show that with the preparation margin located more than 1.5 millimeters subgingival, it is no longer possible to fully remove the cement residues. Positioning of the preparation margin of maximum one millimeter subgingival is therefore aimed for with cemented reconstructions. After checking the abutment in the mouth, fabrication of the zirconium dioxide crowns is undertaken, also using the double scan method. For this purpose, the abutment is scanned and the data record obtained is applied to the existing virtual data record from the wax-up. For a durable zirconium dioxide restoration, it is necessary to adhere to the required material parameters of the zirconium dioxide framework, as well as those for the zirconium ceramic. It is therefore recommended not to exceed a framework thickness for zirconium dioxide of 0.5 millimeters and a veneer thickness of the zirconium ceramic of 1.5 millimeters. After fitting, the ready milled and sintered zirconium crowns are individually veneered. The high-strength zirconium ceramic Creation CT from Willi Geller Creation are used for this purpose. This material offers the technician the possibility of fabricating a highly esthetic and stable restoration. The esthetic try- in allows assessment of the result of the dental laboratory work, the approximal sealing strip to be inspected and the functionality of the restoration to be checked. The crowns are then finished in the lab (Figs. 30 and 31) . Even smaller shape and shade corrections are undertaken here and the surface enhanced. Durelon from 3M Espe was used for semi-permanently cementing the crowns in the mouth. Figures 32 to 34 show that the final situation with the final prosthetics on implants 21, 22 in situ.