A case report of acute pyelonephritis secondary to maxillary sinusitis caused by implant displacement

This case demonstrates the risk of maxillary sinusitis due to implant displacement into the maxillary sinus. Severe maxillary sinusitis with secondary systemic diseases is possible. Moreover, for maxillary sinusitis caused by dislodged implants, simple antibiotic treatment is often difficult to be effective, and the cause of the disease needs to be removed as early as possible.