Hedrick R T, Dove S B, Peters D D, McDavid W D
University of Texas Health Science Center at San Antonio.
J Endod. 1994 Jul;20(7):320-6. doi: 10.1016/s0099-2399(06)80093-2.
This research compared the length determination images produced by Trophy and Regam direct digital radiographic systems with conventional E-speed radiographs. Size #15 K files were placed in the canals of 19 teeth of cadaver specimens and radiographed in a geometrically standardized bench device. Three evaluators estimated the length adjustment necessary to position the file at the apex. The mean estimated adjustment lengths were compared with the true, anatomically determined adjustment lengths. Statistical analysis with analysis of variance and the Student-Newman-Keuls test indicated no significant difference between direct digital thermal print images and conventional radiographs (p > 0.10). Length adjustment estimates with conventional radiographs were significantly more accurate than Regam high-resolution computer monitor images (p < 0.01). Additionally, it was determined that length adjustment estimates were significantly more accurate when the file was placed short of the apex (p < 0.001). The clinical relevance of these differences is discussed.
本研究将Trophy和Regam直接数字放射成像系统所生成的长度测定影像与传统E速X线片进行了比较。将15号K锉放入19颗尸体标本牙齿的根管中，并在几何形状标准化的台式设备中进行X线摄影。三名评估者估计将锉放置在根尖处所需的长度调整。将平均估计调整长度与解剖学确定的真实调整长度进行比较。方差分析和Student-Newman-Keuls检验的统计分析表明，直接数字热敏打印影像与传统X线片之间无显著差异（p>0.10）。传统X线片的长度调整估计比Regam高分辨率计算机显示器影像显著更准确（p<0.01）。此外，还确定当锉放置在根尖短于根尖处时，长度调整估计显著更准确（p<0.001）。讨论了这些差异的临床相关性。
