Microscope-assisted 3D bone augmentation using the tunnel technique

A three-dimensional alveolar ridge augmentation was recorded under the ZEISS EXTARO 300. The video demonstrates the tunnel approach combined with the 3D autogenous split bone block technique described by Prof. Dr. Fouad Khoury¹. By preserving the mucoperiosteal envelope and avoiding a crestal incision directly above the graft, the tunnel technique maintains vascularization and provides favorable conditions for healing. However, restricted access and limited visibility make the procedure technically demanding. Magnification and bright coaxial illumination provide a detailed view even in deep areas of the tunnel. Combined with microsurgical instruments, this enables delicate flap elevation, precise adaptation and fixation of the cortical bone blocks, and dense filling of the biological box with autogenous bone chips, particularly in areas that would otherwise be difficult to visualize. Improved hemostasis and microsurgical wound closure further minimize tissue trauma and support passive wound-edge approximation. The combination of the tunnel technique and microscope-assisted surgery may reduce postoperative complications and promote predictable bone regeneration.