Antonijević Djordje, Ilić Dragan, Medić Vesna, Dodić Slobodan, Obradović-Djuriĉić Kosovka, Rakoĉević Zoran
Vojnosanit Pregl. 2014 Nov;71(11):1006-12. doi: 10.2298/vsp1411006a.
BACKGROUND/AIM: The radiopacity of an endodontic material can considerably vary as measured on film and a digital sensor. Digital radiography offers numerous advantages over conventional film-based radiography in dental clinical practice regarding both diagnostic capabilities and postintervention procedures. The aim of this study was to investigate the capacity of conventional and charge-conpled device (CCD) based digital radiography to detect material on radiograph depending on the radio-pacifying agent present in the mate- rial.
Experimental cements were formulated by mixing Portland cement with the following radiopacifying agents: zinc oxide (ZnO), zirconium oxide (ZrO2), titanium dioxide (TiO2), barium sulphate (BaSO4), iodoform (CHI3), bismuth oxide (Bi2O3) and ytterbium trifluoride (YbF3). In addition, 5 endodontic materials comprising Endometh- asone, Diaket, N2, Roth 801 and Acroseal were investigated to serve as control. Per three specimens of each material were radiographed alongside an aluminum step wedge on film (Eastman Kodak Company, Rochester, NY) and a CCD-based digital sensor (Trophy Radiologie, Cedex, France). Radiopacity values were calculated by converting the radiographic densities of the specimens expressed as a mean optical densities or mean grey scale values into equivalent thickness of aluminum.
Two-way ANOVA detected no significant differences with respect to the imaging system (p > 0.05), but the differences were significant with respect to radiopacifier (p < 0.001) and the interaction of the two factors (p < 0.05). Paired t-test revealed significant differences between the methods used for pure Portland cement, all concentrations of BaSO4 and CHI3, 10% and 20% additions of ZrO2 and Bi2O3 and 10% and 30% additions of YbF3 (p < 0.05).
The materials which incorporate CHI3 OR BaSO4 as radiopacifying agents are expected to be significantly more radiopaque on a digital sensor than on film. During clinical practice one should concern to the quality of contrast assessment obtained by digital according to conventional radiography.
背景/目的：牙髓材料在胶片和数字传感器上测量时的射线不透性可能有很大差异。在牙科临床实践中，数字放射摄影在诊断能力和干预后程序方面比传统的基于胶片的放射摄影具有许多优势。本研究的目的是根据材料中存在的射线阻射剂，研究传统的和基于电荷耦合器件（CCD）的数字放射摄影在射线照片上检测材料的能力。
通过将波特兰水泥与以下射线阻射剂混合来配制实验性水泥：氧化锌（ZnO）、氧化锆（ZrO2）、二氧化钛（TiO2）、硫酸钡（BaSO4）、碘仿（CHI3）、氧化铋（Bi2O3）和三氟化镱（YbF3）。此外，研究了5种牙髓材料，包括Endomethasone、Diaket、N2、Roth 801和Acroseal作为对照。每种材料的三个标本与铝阶梯楔形块一起在胶片（伊士曼柯达公司，纽约罗切斯特）和基于CCD的数字传感器（Trophy Radiologie，法国塞德克斯）上进行射线照相。通过将标本的射线照相密度（表示为平均光学密度或平均灰度值）转换为铝的等效厚度来计算射线不透性值。
双向方差分析未发现成像系统方面的显著差异（p>0.05），但射线阻射剂方面的差异显著（p<0.001），且两个因素的相互作用方面的差异也显著（p<0.05）。配对t检验显示，用于纯波特兰水泥、所有浓度的BaSO4和CHI3、10%和20%添加量的ZrO2和Bi2O3以及10%和30%添加量的YbF3的方法之间存在显著差异（p<0.05）。
含有CHI3或BaSO4作为射线阻射剂的材料在数字传感器上的射线不透性预计比在胶片上显著更高。在临床实践中，应关注根据传统放射摄影通过数字方式获得的对比度评估质量。
