RADIOPAQUE FOREIGN bodies in the maxillary sinus are found infrequently. Their presence is usually associated with a traumatic episode well known to the patient, such as a gunshot accident or severe facial injury. The most frequent foreign body found in the sinus, yet unknown to the patient, is a tooth fragment lost at the time of extraction. Tooth fragments are usually recognized by the degree of density on the radiograph and their general outline. An unusual radiopaque foreign body in the maxillary sinus associated with the extraction process, yet having no consistent radiographic density or distinguishing pattern, is denture impression paste.
Maxillary molar teeth are embedded in the alveolar ridge which forms the floor of the maxillary sinus. The second bicuspid tooth, and to a lesser extent the first bicuspid tooth, is located beneath the anterior extension of the maxillary sinus. Extraction of these teeth occasionally creates a direct passage
Smith HW, Guttenberg I. Dental Impression Paste in the. Arch Otolaryngol. 1968;87(2):174–180. doi:10.1001/archotol.1968.00760060176017
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