The Endoscopic Removal of a Detached Dental Implant Cap in the Maxillary Sinus During the Waiting Period: A Case Report.

Displacement of dental implants into the maxillary sinus is one of the common dental complications. However, it is rare that dental implants cause the displacement of multiple components due to separation. Here, we describe an unusual case of a 43-year-old man who had a missing implant in the maxillary sinus after an implant procedure. There was a two-week waiting period before we performed the removal during which the cap had unexpectedly separated from the body and freely moved into the ostium by sinus activity. The body was independently extracted intraorally. The remaining cap was secondly removed by utilizing nasal endoscopy. There were no complications in the postoperative period and the patient reported no symptoms of sinusitis after two months of follow-up. We experience unexpected events in the course of treating a displaced implant into the maxillary sinus. Our case report may provide several learning points for the removal of a missing implant.