University of Santiago de Compostela, Santiago de Compostela, Spain.
Dentomaxillofac Radiol. 2011 Sep;40(6):385-9. doi: 10.1259/dmfr/45365752.
The aim of this report is two-fold. First it analyses the precision of a modification of the parallel technique that can be used in those cases with anatomical limitations. Second, it checks the influence of the reference points' definition of objects to be measured by using both the original and the modified radiographic techniques. 2 intraoral radiographs were taken of 28 implants with 2 different methods: a standard paralleling technique and a modified technique that used a smaller film and a silicone spacer to ensure parallelism. Measurements of peri-implant bone levels and implant width were made in triplicate on digitized film radiographs. The results of the peri-implant bone levels were that with the parallel method the mean was 0.44 mm and the precision was 0.43 mm, and with the modified method the mean was 0.73 mm and the precision was 0.66 mm. In addition to the correct localization of the point of reference in this study, the precision with the parallel method was 0.08 mm and with the modified method was 0.13 mm. Although it was greater with the gold standard technique than with the modified technique, precision was very high for both methods and accurate enough for clinical use.
本报告的目的有二。首先，它分析了一种可用于解剖限制情况下的平行技术的改进的精度。其次，它检查了参考点的定义对要测量的物体的影响，同时使用原始和改进的射线照相技术。对 28 个种植体拍摄了 2 个不同方法的 2 个口内射线照片：标准平行技术和使用小胶片和硅树脂间隔物来确保平行的改进技术。在数字化胶片射线照片上对种植体周围骨水平和种植体宽度进行了三次重复测量。种植体周围骨水平的结果是，平行法的平均值为 0.44 毫米，精度为 0.43 毫米，改良法的平均值为 0.73 毫米，精度为 0.66 毫米。除了本研究中正确定位参考点外，平行法的精度为 0.08 毫米，改良法的精度为 0.13 毫米。尽管金标准技术的精度比改良技术高，但两种方法的精度都非常高，足以满足临床应用。
