This analysis examined the types of retreatment in failed sinus bone grafts due to the development of maxillary sinusitis. Reoperation was performed in 7 patients. The types of reoperation included infection management, reconstruction of the sinus roof using a pedicled buccal fat pad and collagen membrane, oroantral fistula closure, sinus bone graft using an autogenous bone graft, and implant placement. In one case, sinusitis developed 14 months after the reoperation, but it was managed by incision, drainage, and administration of antibiotics. All sinus bone grafts that were performed during the retreatments were successful.
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