Implant dislocation into the maxillary sinus after 30 years of loading due to peri-implantitis: A case report.

Progressive peri-implantitis in the posterior maxilla can lead to the dislocation of dental implants into the sinus and subsequent chronic sinusitis. Removing the implant through a bone lid from the lateral sinus wall with simultaneous sinus revision is an effective way to treat this condition and allows for later bone grafting and implant placement.