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9 CASE STUDY Fig. 13: The porcine bone lamina was stretched over the augmentation material and fixed lingually with a holding suture to prevent any movement. Fig. 14: The plasma obtained in the centrifuge contains growth factors and can be applied or inserted anywhere that requires rapid wound healing. Fig. 20: The flap was split deep in the vestibulum and the mobile gingival parts were fixed apically to prevent movements of the peri-implant soft tissue. Fig. 15: For better integration and healing, a layer of autolo- gous fibrin was placed over the lamina. Fig. 21: A free mucosal graft from the palate was fixed stably and with a perfect fit using simple interrupted and cross-stitch sutures. Fig. 19: Before the exposure, it became apparent that the minimum requirement for keratinized gingiva could not be achieved with a simple apically positi- oned flap. caps are replaced with wide-body healing caps to expand the peri-implant tissue in the emergence profile and to prepare for the individual superstructures (Fig. 22 and 23) . The prosthetic phase A healing time of two months after trans- plantation has proven to be a success- ful strategy with us. After this time we no longer observed any changes in the mucosa. After preparation of the teeth with a pronounced concave hollow, the preparation margins are outlined using a double-thread technique and the impres- sion posts are screwed on (Fig. 24) . The impression is taken with silicone in an individual tray and then checked for completeness. Only when all parts of the preparation margins are clearly reproduced is the fabrication of the working cast or- ganized in the dental laboratory (Fig. 25) . A study has shown that residual excess cement was responsible in more than 80% of all cases of peri-implant disease; this is due to the deep location of the cement gap in ready-made parts and it is for this reason that we have not used them for eight years [26]. We want to continue cementing our restorations, however, and therefore try to work in harmony with the biology. This includes first and foremost using individual ceramic parts near the gingiva to locate the cement margins only slightly below the gingiva or even better epigingivally. In areas that are not visible the clinician should even consider placing these margins significantly supragingi- vally. However, in our opinion full ceramic abutments should be avoided in the posterior region in particular, because fractures are often observed in this area due to the large chewing forces. We be- lieve that the implant-abutment connec- Fig. 23: …at this point the straight healing caps were replaced by wide-body healing caps to shape the peri-implant soft tissue. Fig. 22: After three weeks the transplanted soft tissue could barely be differentiated from the surrounding tissue… Fig. 24: After the preparation of the teeth with a pronounced concave hollow, the impression posts are screwed on.