Abstract
Migration of oral implants through a previously consolidated graft is an extremely rare event. We reported 2 cases of migration at least 6 months postimplantation in sinus grafted in 2 stages, consequently over 6-month graft maturation period. Sinus elevations and implants placement in 2 patients were performed. Clinical and radiographic follow-up after the prosthetic rehabilitation showed displacement of 1 implant in each patient through the histopathologically verified stable grafts. Implants migration through composite graft after maxillary sinus elevation was reported. Reasons for this to occur might be due to the following: fail to achieve implant primary stability, Schneiderian membrane perforation, or graft resorption due to increased osteoclastic activity.
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