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7 CASE STUDY Fig. 4: After the flap formation, the occlusal view revealed the hard tissue defect in the implant region. Fig. 5: The implant bed was prepared successively with rotary instruments in the correct position for the prosthesis using a guide template. Fig. 6: Before the implantation the vestibular cortical bone was perforated. The bleeding sites encourage more rapid migration of vital cells. Fig. 7: After insertion of the implant, the guide temp- late was again positioned to check optimal alignment of the prosthesis. Fig. 8: The image shows the exposed threads of the im- plant and the very thin buccal bone wall prior to the bone augmentation. Fig. 9: To prevent movements in the augmentation material, a very thin and stable bone lamina was first fixed to the bone with resorbable pins to act as a membrane. this allows us to reliably avoid damag- ing the surface of the implant with the Lindemann bur. We inserted a CAMLOG ® SCREW-LINE implant with a diameter of 4.3 mm in regio 35 and a CAMLOG ® SCREW-LINE implant with a diame- ter of 5 mm in regio 36. Both implants have a length of 11 mm, which is in accordance with current trends towards overall shorter implants.Thecorrectposition was then checked again using the template toguaranteeanoptimal prosthetic restoration (Fig. 7) . After the insertion, the bone defect had to be augmented on the buccal side (Fig. 8) . The prerequisite for successful bone aug- mentation is healing of the augmentation material in a stable position with no com- plications. The augmentation material must be covered and any movement prevented because otherwise there is connective tissue healing that endangers the long-term success [1, 6, 7, 17]. If one opts for augmentation in the lower po- sterior area with particulate material without adequate stabilization, it must be expected that the strong muscle pulls from the cheek and the resultant movement will ensure that complete bone regenera- tion will not take place. A rapidly resorbed collagen membrane as a simple support is also not suitable [13,14]. Therefore, in our practice we have applied a technique for many years that relies on a very slowly resorbed membrane. This membrane is also a little stiff, which ensures that the augmentation material does not move and also gives the underlying material enough time to migrate into stable bone [25]. OsteoBiol Soft Cortical Lamina, a thin, smooth porcine cortical bone lamina containing collagen, is the best option to allow the underlying regenerated tissue to mature. The lifetime of the membrane is about six months, which is optimal for the augmentation material if additional xenogeneic material is used. After hydration in PRGF and subsequent fixation with resorbable pins (Inion Tac), it can be cut very easily to shape. The membrane remains absolutely stable while still being adequately flexible (Fig. 9) . Fewer of our patients want to use auto- logous bone as an augmentation material because they fear an additional procedure for the harvesting. We believe that the use of purely xenogeneic material does not achieve the desired outcome for the augmentation because the osteoinductive potency is almost zero, the material is not resorbed enough, and as a result, the proportion of newly formed vital bone is too low. To encourage bone regeneration, therefore, for the last four years we have used allogeneic bone that comprises 80% of the augmentation material. The allogeneic bone has osteoinductive poten- tial and leads to exceptional regeneration [12,28]. The remaining 20% of the aug- mentation material is made up of BioOss and PRGF (Fig. 10) . This mixture produces a very easy to process matrix that can be easily adjusted and adapted to any defect geometry (Fig. 11 and 12) . The minimally resorbed, xenogeneic bone substitution material is added to safeguard the long- term volume stability. The Soft Cortical Lamina is then stretched over the augmentation material and fixed