Fig. 2.

Case presentation of patient no. 4 (case no. 5 - right mandible) from the simultaneous group. a Baseline CBCT scan, parasagittal section: horizontovertical alveolar defect. b Baseline CBCT scan, frontal section: horizontovertical alveolar defect. c Clinical view of edentulous mandible. d Split-thickness flap preparation. e Guided implant placement, supracrestally positioned implant (Straumann bone level). f Adaptation of non-resorbable membrane (Osteogenics Cytoplast) over the composite graft. g Membrane fixation using titanium pins. h Double-layer suturing. i Postoperative intraoral X-ray. j Healed alveolar ridge 9 months after simultaneous GBR. k Membrane removal at 9 months reentry. l, m, n Optimal amount of hard tissue; previously placed distal implant is covered with hard tissue, additional implant placed mesially