Larheim T A, Svanaes D B
Am J Orthod Dentofacial Orthop. 1986 Jul;90(1):45-51. doi: 10.1016/0889-5406(86)90026-0.
The reproducibility of nine mandibular variables (linear dimensions and angles) assessed from panoramic radiographs with the Orthopantomograph 5 (Siemens) was investigated. Attention was given to the possible influence of recording the reference number of the head positioner with one or two radiographers. Two separate exposures of three groups of patients were made under different radiographic conditions, each group representing one method. Acceptable reproducibility was observed for the vertical and angular variables, the method variance being mostly within 3% of the total variance. Horizontal variables were clearly more unreliable. No statistically significant differences were observed between the reproducibility of the right and left sides. A negative correlation was found between the angular variables within two groups. For most variables, only small differences among the methods were found. The highest reliability was obtained when the same radiographer recorded the reference number of the head positioner and made both exposures. An accuracy study on five dried skulls showed an image magnification of approximately 18% to 21% for the vertical variables, whereas the gonial angle assessed from a panoramic film was almost identical to that measured on the dried mandible.
研究了使用Orthopantomograph 5（西门子）全景X线片评估的九个下颌变量（线性尺寸和角度）的可重复性。研究关注了由一名或两名放射技师记录头部定位器参考编号可能产生的影响。在不同的X线摄影条件下对三组患者进行了两次单独曝光，每组代表一种方法。垂直和角度变量具有可接受的可重复性，方法差异大多在总差异的3%以内。水平变量明显更不可靠。左右两侧的可重复性之间未观察到统计学上的显著差异。发现两组内角度变量之间存在负相关。对于大多数变量，各方法之间仅发现微小差异。当由同一名放射技师记录头部定位器的参考编号并进行两次曝光时，获得了最高的可靠性。对五个干燥颅骨的准确性研究表明，垂直变量的图像放大率约为18%至21%，而从全景片评估的下颌角与在干燥下颌骨上测量的几乎相同。
