Patients with severely atrophic posterior maxillae and increased pneumatization of the maxillary sinus may lack adequate bone height for endosteal implant placement. Grafting of the maxillary sinus via a sinus lift procedure augments the atrophic ridge and allows for such implants. Grafting with bone harvested from intraoral sites has distinct advantages over other previously described techniques. Schlagwörter: atrophic maxillae, autogenous graft, endosteal implants, sinus lift