Study on the image diagnosis of maxillary sinus abnormality using panoramic radiography

本研究是为了比较上颌窦骨缺损的检测。用全景x线摄影、沃特斯投影和计算机断层扫描（CT）对干颅骨进行了实验比较。模拟上颌畸形骨缺损直径分别为5mm、7mm和10mm。骨缺损放置于上颌窦后壁的中心、中上区（靠近翼腭窝）、后下区（上颌结节上方）、外侧区（靠近上颌骨颧突）和上颌骨颧牙槽区。实验结果如下：1.实验结果表明：上颌窦后壁各区域直径大于5mm的骨缺损在CT上表现最好。2. 在上颌窦后壁的后下区和上颌骨颧牙槽区，直径大于5mm的骨缺损，在全景x线片上表现较好。在后壁的中上区域，直径大于7mm的骨缺损也可以通过全景x线片更好地显示。3. waters’投影仅能检测到上颌骨颧-牙槽区直径大于5mm的骨缺损。

This study was undertaken as a comparison in detection of bony defects in the maxillary sinus. Comparison was done experimentally on dry skulls using panoramic radiography, Waters' projection, and computed tomography( CT ). Bony defects with diameters of 5mm, 7mm, and 10mm were simulated for maxillary abnormality. Bony defects were placed in the center, the medio-superior region( adjacent to the pterygopalatine fossa ), the latero-inferior region( above the maxillary tuberosity ), the lateral region( adjacent to the zygomatic process of the maxilla ) of the posterior wall of the maxillary sinus and the zygomatico-alveolar region of the maxilla.The results were as follows: 1. Bony defects with diameters of more than 5mm in every area of the posterior wall of the maxillary sinus are best demonstrated by CT. 2. Bony defects, with diameters of more than 5mm in the latero-inferior region of the posterior wall of the maxillary sinus and in the zygomatico-alveolar region of the maxilla, are better shown by panoramic radiography. Bony defects with diameters of more than 7mm in the medio-superior region of the posterior wall, also, are better shown by panoramic radiography. 3. The waters' projection was only able to detect bony defects with diameters of more than 5mm in the zygomatico-alveolar region of the maxilla.