Jung Yun-Hoa, Cho Bong-Hae, Hwang Jae Joon
Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan, Korea.
Imaging Sci Dent. 2020 Dec;50(4):309-318. doi: 10.5624/isd.2020.50.4.309. Epub 2020 Dec 15.
This study investigated correlations between findings on panoramic radiographs and cone-beam computed tomography (CBCT) to assess the relationship between the maxillary sinus floor and the roots of maxillary posterior teeth. In addition, radiographic signs indicating actual root protrusion into the maxillary sinus were evaluated on panoramic radiographs.
Paired panoramic radiographs and CBCT images from 305 subjects were analyzed. This analysis classified 2,440 maxillary premolars and molars according to their relationship with the maxillary sinus floor on panoramic radiographs and CBCT images. In addition, interruption of the sinus floor was examined on panoramic radiographs.
Root protrusion into the maxillary sinus occurred most frequently in the mesiobuccal roots of the second molars. The classification according to panoramic radiographs and CBCT images was the same in more than 90% of cases when there was no contact between the root apex and the sinus floor. When the panoramic radiograph showed root protrusion into the sinus, the CBCT images showed the same classification in 67.5% of second molars, 48.8% of first molars, and 53.3% of second premolars. There was a statistically significant relationship between interruption of the sinus floor on panoramic radiographs and root protrusion into the sinus on CBCT images.
The presence of root protrusion into the sinus on panoramic radiographs demonstrated a moderate ability to predict root protrusion into the maxillary sinus. Interruption of the maxillary sinus floor could be considered an indicator of actual root protrusion into the maxillary sinus.
本研究调查全景X线片和锥形束计算机断层扫描（CBCT）结果之间的相关性，以评估上颌窦底与上颌后牙牙根之间的关系。此外，还在全景X线片上评估了表明牙根实际突入上颌窦的影像学征象。
分析了305名受试者的配对全景X线片和CBCT图像。该分析根据全景X线片和CBCT图像上它们与上颌窦底的关系，对2440颗上颌前磨牙和磨牙进行了分类。此外，还在全景X线片上检查了窦底的连续性中断情况。
牙根突入上颌窦最常见于第二磨牙的近中颊根。当根尖与窦底无接触时，超过90%的病例中全景X线片和CBCT图像的分类相同。当全景X线片显示牙根突入窦内时，CBCT图像在67.5%的第二磨牙、48.8%的第一磨牙和53.3%的第二前磨牙中显示相同的分类。全景X线片上窦底的连续性中断与CBCT图像上牙根突入窦内之间存在统计学上的显著关系【此处原文有误，应为全景X线片上窦底的连续性中断与CBCT图像上牙根突入窦内之间存在统计学上的显著关系】。
全景X线片上牙根突入窦内的表现具有中等的预测牙根突入上颌窦的能力。上颌窦底的连续性中断可被视为牙根实际突入上颌窦的一个指标。
