Since the introduction of cephalometric radiology by Broadbent to dentistry, this technique has been widely used for radiometry of the maxillo-facial-cranium. In this study, ceplalometric radiography was used to quantitatively and qualitatively analyze a foreign body in the tongue. A 77-year-old man, whose tongue was injured by an airturbine steel bur during dental treatment, was referred by his dentist to our department to search for a broken steel bar in the tongue. Panoramic, postero-anterior, and lateral cephalometric radiographic examinations were performed for the patient. Of the individual radiographical examination, the cephalometric radiography gave the exact position of the foreign body in the tongue. According to the radiographical examinations, mainly by cephalometric radiography, the three dimentional position of the forign body in the tongue could be determined. The location of the foreign body, which was determined by radiographical examination, was found exactly at the position indicated by radiography. These results suggest that cephalometric radiography may be suitable for localizing the radiopaque foreign bodies in the tongue.
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