Almenar García A, Forner Navarro L, Ubet Castelló V, Miñana Laliga R
Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia, Spain.
J Endod. 1997 Jun;23(6):363-5. doi: 10.1016/s0099-2399(97)80183-5.
The working lengths obtained with different methods in single-rooted teeth were compared. An endodontic rule in millimeters and calipers was used as a direct method of measurement (on endodontic files). As indirect methods, measurements were taken from conventional x-rays with calipers and with a digital radiological measurement system. No statistically significant differences were obtained between the direct and indirect methods. Three vertical angulations were taken for the indirect methods (0 degree, 15 degrees, and 30 degrees). No significant differences were found between results for the two indirect methods versus the standard method except for the 30 degrees angulation, which resulted in an impression of a shortened image of about 1.5 mm when using the indirect methods (significance level: alpha = 0.05).
比较了在单根牙中使用不同方法获得的工作长度。使用毫米刻度的牙髓测量尺和卡尺作为直接测量方法（用于牙髓锉）。作为间接方法，使用卡尺从传统X线片以及使用数字放射测量系统进行测量。直接法和间接法之间未获得统计学上的显著差异。间接法采用了三个垂直角度（0度、15度和30度）。除了30度角度外，两种间接方法与标准方法的结果之间未发现显著差异，当使用间接方法时，30度角度导致图像缩短约1.5毫米的印象（显著性水平：α = 0.05）。
