## 4 Discussion
However, it has been determined that these complications either occur when matching the block to the bone defect or are the result of improper management of soft tissues, which results in the exposure of the graft, the opening of the wound, and perforation of the mucosa [22; 23]. It was also shown that these complications are more common in the mandible due to its lower vascularization, as well as the fact that the flap is more difficult to manage [12]. Thus, proper evaluation of soft tissues is essential in planning bone augmentation procedures. In cases of an insufficient amount of soft tissues and an increased risk of the inability to close the wound without excessive tension of the flap, implementation of correction/augmentation procedures preceding the actual bone reconstruction surgery is recommended. Such a procedure was carried out in the presented case. The performed procedures conducted on soft tissues allowed for obtaining their sufficient width and thickness and avoiding the primary closure of the wound with excessive tension of the flap. In turn, the use of a fully individualized three-dimensional allogeneic bone block allowed for the restoration of the correct morphology of the anterior mandibular segment of the alveolar part, which had dentition, and which was characterized with existing advanced soft tissue dehiscences and recessions. The perfect fit of the block to the recipient site minimized the risk of graft contamination when adjusting it in the shortest possible contact time, and at the same time ensuring its stability and the lack of mobility towards the base. After two years, based on clinical observations, it was stated that the intended therapeutic effect was achieved. There was no recession, shallowing of the vestibule, signs of inflammation, or pathological mobility of the teeth in the area undergoing reconstruction. The radiographic images revealed the formation of a new layer of cortical bone on the vestibular side and a certain volume of cancellous bone. It is worth noting that the block was prepared only from the spongy bone. This is probably related to the way bone blocks are remodeled, which depends on the force and physiological loads acting on them [24]. Moreover, there was no radiological demarcation zone of brightening, which could indicate an incomplete adaptation, integration and reconstruction of the bone block. Similar findings in CBCT studies were reported by [PERSON] et al., who also indicated the formation of a compact bone layer after a 10-month observation. Their histological analysis confirmed that the augmented tissues showed a high degree of mineralization, without signs of inflammation. Moreover, the ongoing reconstruction process was noticed. Concavities, which are characteristic of remodeling, were also observed. They concluded that the area of nonmineralized tissue located apically to the specimen probably resulted from soft tissue parts being attached to the outer surface. Soft tissue was also observed at the apical part of the specimen. The authors concluded that the accumulation of soft tissue represents the border zone between the graft and the native bone. They also emphasized that an area with the increased lining of connective tissue at the distal part of the biopsy specimen indicates the border zone between native bone and augmented bone [22]. The limitation of this method is the cost of making the bone block, which requires many stages, both in terms of planning and production. Due to the fact that this is a patented method not yet in commercial use, it increases the costs further. However, we hope that the detailed presentation of the method, both in the technical and clinical aspects, along with showing its positive results, will allow for commercialization and widespread use in specific patients' indications. To confirm the effectiveness of the reconstruction and to show the bone remodeling, patients are subjected to CBCT scans every six months (up to 2-3 years).