Five Ectopic Teeth in the Maxillary Sinus: A Rare Cause of Chronic Sinusitis.

Around 10-20% of sinusitis have a dental etiology. Odontogenic sinusitis is generally caused by periodontitis, peri-implantitis, periapical pathology, or oroantral communication. Ectopic teeth are a rare cause of chronic odontogenic sinusitis.