パノラマ X 線撮影, 咬合 X 線撮影, および歯根尖 X 線撮影による上顎洞病変の検出に関する実験的研究

Abstract

Panoramic radiography was originally devised to obtain a panoramic view of the jaws using a single film. At that time panoramic radiography was entirely used for examination of lesions of the jaws. However, due to the fact that the maxillary sinus is clearly observable using panoramic radiography, it has been used for the detection of maxillary sinus pathosis. There are only a few experimental studies on the detection of maxillary sinus pathosis, such as a globular radiopacity or bony defect, using panoramic radiography, Waters' projection or posteroanterior projection. However, there have been few studies comparing the detection of maxillary sinus pathosis between panoramic, occlusal, and periapical radiographies. In this study the detection of a globular radiopaque mass in the maxillary sinus of a dry skull was compared experimentally using panoramic, occlusal, and periapical radiographies. Oil-clay mass with diameters of 2mm, 3mm, 5mm, and 7mm were used as globular radiopaque masses, and they were always placed on the internal surface of the left maxillary sinus. The results obtained were as follows : 1. Globular radiopaque masses with diameters of 3mm, 5mm, and 7mm were put on the anterior wall of the maxillary sinus. The 3mm, 5mm, and 7mm masses were all detected by panoramic radiography, but only the 5mm and 7mm masses were detected by maxillary oblique occlusal radiography. In both radiographies the correct positions of the masses in the sinus were not clear. 2. Globular radiopaque masses with diameters of 2mm, 3mm, 5mm, and 7mm on the posterior wall of the maxillary sinus were better shown by panoramic radiography. In panoramic radiography it was possible not only to detect the masses, but also to determine their correct positions in the sinus. However, a 7mm mass was not detected by either maxillary oblique or hemi-maxillary occlusal radiographies. 3. Globular radiopaque masses with diameters of 2mm, 3mm, 5mm, and 7mm were put on the medial wall of the maxillary sinus. The 2mm, 3mm, 5mm, and 7mm were detected by panoramic radiography, but only the 5mm and 7mm masses were detected by maxillary oblique occlusal radiography. In both radiographies the correct positions of the masses in the sinus were not clear. 4. Globular radiopaque masses with diameters of 3mm, 5mm, and 7mm on the anterior region of the floor of the maxillary sinus were better shown by panoramic and maxillary oblique occlusal radiographies. In both radiographies it was possible not only to detect the masses, but also to determine their correct positions in the sinus. 5. Globular radiopaque masses with diameters of 3mm, 5mm, and 7mm on the middle and posterior regions of the floor of the maxillary sinus were better shown by panoramic, maxillary oblique occlusal, and periapical radiographies. In these radiographies it was possible to determine their correct positions in the sinus. 6. A globular radiopaque mass with a diameter of 2mm on the floor of the maxillary sinus was not detected by panoramic, maxillary oblique occlusal, or periapical radiographies.