[Removal of the displaced implant from the maxillary sinus: report of one case].

Accidental displacement of end osseous implants into the maxillary sinus is an uncommon but potential complication in implant surgery due to the special features of the posterior aspect of the maxillary bone. The authors reported one case implant displacement into the maxillary sinus by lateral window technique. The causes for displacement, preventive measures were summarized, in order to avoid this kind of complication.