Review of the Long-Term Outcomes of Guided Bone Regeneration and Autologous Bone Block Augmentation for Vertical Dental Restoration of Dental Implants.

Vertical bone resorption is a frequent consequence of tooth loss. Hence, implant-supported restorations imply, first of all, bone reconstruction. We aimed to review the current status of guided bone regeneration and autologous bone block augmentation for vertical dental restoration of dental implants. This review identified that between 2009 and 2022 there were few clinical studies that included more than 10 patients and a follow-up period of more than 5 years after bone restoration. The highest vertical bone gain was reported in the autologous bone grafting technique (4-7.6 mm), whereas the minimum augmentation was reported for one of the guided bone regeneration techniques. When comparing intraoral to extraoral bone blocks, the highest values for the mean vertical bone gains were obtained in the cases in which intraoral bone blocks were used as graft material. The highest rate of bone resorption was observed in the extraoral bone block group. Implant survival rate was not significantly influenced by surgical technique. Complications had a higher incidence in autologous bone block augmentation studies. Soft tissue recession showed similar results for guided bone regeneration as for autologous bone block augmentation. Vertical ridge augmentation is a predictable option for the reconstruction of alveolar ridges with severe atrophy, but complications can appear.