Tal H, Moses O
Department of Periodontology, Tel Aviv University, Israel.
Dentomaxillofac Radiol. 1991 Feb;20(1):40-2. doi: 10.1259/dmfr.20.1.1884852.
The accuracy of panoramic radiography and computed tomography (CT) in the evaluation of depth of the mandible at recipient implant sites was compared by measuring the distance between the edentulous bony crest and the superior border of the inferior alveolar canal in a group of ten patients. Distortion was calculated using the metal ball technique for the panoramic radiographs and the computer scale for the CT scans. The precise distance between the bony crest and inferior alveolar canal was determined from postoperative radiographs from the known length of the implants. It was found that although CT scans are more precise, panoramic radiography is sufficiently accurate for routine clinical purposes. CT scans have, however, an additional advantage in presurgical planning, since they reveal the horizontal dimension and shape of the mandible, and the topography and buccolingual location of the inferior alveolar canal.
通过测量一组10例患者无牙牙槽嵴与下牙槽神经管上缘之间的距离，比较全景X线摄影和计算机断层扫描（CT）在评估下颌骨种植受区部位深度方面的准确性。使用金属球技术计算全景X线片的失真度，使用计算机测量CT扫描的失真度。根据植入物的已知长度，从术后X线片中确定牙槽嵴与下牙槽神经管之间的精确距离。结果发现，虽然CT扫描更精确，但全景X线摄影对于常规临床目的而言准确性足够。然而，CT扫描在术前规划方面还有一个额外的优势，因为它们可以显示下颌骨的水平尺寸和形状，以及下牙槽神经管的形态和颊舌位置。
