Figure 2: Graphical depiction of anatomical correlation and biological similarity of sinus lift versus buccal subperiosteal tunnel technique-augmentation-sites (overview (a), detail (b); periosteal cover of all bone surfaces depicted in yellow) MB: maxillary bone outlines (red) MP: mucoperiosteum of the oral cavity, SP: sinus periosteum of the maxillary sinus, P: periosteal cover of facial bones, BM: biomaterial applied subperiosteally in sinus lift and subperiosteal tunnel site, and ta: transcrestal approach of the tHUCSL-INTRALIFT-procedure.