对比反转增强对数字放射成像中根管锉长度测定准确性的影响。
Effect of Contrast Inversion Enhancement on the Accuracy of Endodontic File Length Determination in Digital Radiography.
作者信息
Farhadi Nastaran, Shokraneh Ali, Mehdizadeh Mojdeh
机构信息
Assistant Professor, Department of Oral and Maxillofacial Radiology, School of Dentistry, Physiology Research Center, Ahvaz Jundishapur University of Medical Sciences , Ahvaz, Iran .
Assistant Professor, Department of Endodontics, School of Dentistry, Isfahan University of Medical Sciences , Isfahan, Iran .
出版信息
J Clin Diagn Res. 2015 May;9(5):ZC102-5. doi: 10.7860/JCDR/2015/11767.5988. Epub 2015 May 1.
OBJECTIVE
The aim of this ex vivo study was to evaluate the accuracy of endodontic file length measurement on digital periapical radiographs after application of contrast inversion digital enhancement.
MATERIALS AND METHODS
Forty single-rooted single-canal mature permanent human teeth with canals measuring 20-24 mm in length were used in this study. ISO #08 K-files were placed in the root canals of the teeth. The file lengths were measured with a digital caliper as the gold standard. Standard periapical digital images were obtained with the Digora storage phosphor plates and Digora Optime scanner as the original images. The contrast inversion option of Scanora software program version 5.1 was used to produce enhanced images. Three radiologists and three endodontists measured file lengths on the original and enhanced images. The measurements were compared using repeated measures ANOVA and Bonferroni tests (α=0.05).
RESULTS
There were significant differences between the measurement accuracy of the original and enhanced images (p<0.05). The enhanced images exhibited longer measurements compared to the original images. However, the two sets of digital radiographs provided significantly longer measurements compared to the gold standard (p<0.05).
CONCLUSION
The contrast inversion tool of Scanora software program decreases measurement accuracy of the length of small endodontic files on digital periapical radiographs. It is suggested that contrast inversion should not be used in determining the lengths of small endodontic files.
目的
本体外研究的目的是评估在应用对比度反转数字增强后，数字根尖片上根管锉长度测量的准确性。
材料与方法
本研究使用了40颗单根单管的成熟恒牙，根管长度为20 - 24毫米。将ISO #08 K锉放入牙齿的根管中。用数字卡尺测量锉的长度作为金标准。使用Digora存储磷光板和Digora Optime扫描仪获取标准根尖数字图像作为原始图像。使用Scanora软件程序版本5.1的对比度反转选项生成增强图像。三名放射科医生和三名牙髓病医生在原始图像和增强图像上测量锉的长度。使用重复测量方差分析和Bonferroni检验（α = 0.05）比较测量结果。
结果
原始图像和增强图像的测量准确性之间存在显著差异（p < 0.05）。与原始图像相比，增强图像的测量值更长。然而，与金标准相比，两组数字射线照片的测量值都明显更长（p < 0.05）。
结论
Scanora软件程序的对比度反转工具降低了数字根尖片上小根管锉长度测量的准确性。建议在确定小根管锉的长度时不要使用对比度反转。
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