This is a process applied in the posterior region of the maxilla, which is carried out in cases of insufficient bone height. Here, the maxillary sinus floor is raised by removing mucosa. The cavity obtained by this is filled with a mixture of autogenous bone (chips which are generated by the implant drilling) and bone substitute material. The implant can now be put in place and becomes secure after a six-month healing period. In general, there is no need for extra surgery. Sinus lift and implant placement are carried out during the same procedure.