Tagger M, Katz A
Department of Endodontology, The Maurice & Gabriela School of Dental Medicine, Tel Aviv University, Tel Aviv 69978, Israel.
Int Endod J. 2004 Apr;37(4):260-4. doi: 10.1111/j.0143-2885.2004.00787.x.
To assess the radiopacity of materials used, or recommended for use, as apical root-end (retrograde) fillings.
The radiopacity of 14 materials falling into the category of root-end filling materials was measured in equivalent millimetres of aluminium (mm Al) using a new computerized method. These included temporary or intermediate sealing materials; composite, compomer and GIC filling materials; EBA-derived cements; amalgam, etc. Gutta-percha cone material was added as a control. Samples of 1 mm thickness were radiographed on periapical film alongside an aluminium step wedge calibrated in millimetres, and the opacity of the materials, in greyscale or pseudo-colour, was compared with the equivalent step.
The radiopacity ranged from 1.75 mm Al to >10 mm Al. The lower range appears insufficient for routine clinical detection when it is compared with the minimal requirement for intracanal fillings.
Because of the proliferation of root-end filling materials with a broad range of radiopacity, an international standard stipulating the required minimal radiopacity, as well as other properties, is needed urgently. It should be based on in vitro results and on large-scale clinical radiographic surveys.
评估用作根尖根端（倒充填）充填材料或推荐使用的材料的射线不透性。
采用一种新的计算机化方法，以铝的等效毫米数（mm Al）测量了14种属于根端充填材料类别的材料的射线不透性。这些材料包括临时或中间封闭材料；复合树脂、复合体和玻璃离子水门汀充填材料；EBA衍生的水门汀；汞合金等。添加牙胶尖材料作为对照。将1毫米厚的样本与以毫米校准的铝阶梯楔形块一起在根尖片上进行X线摄影，并将材料的不透性以灰度或伪彩色与等效阶梯进行比较。
射线不透性范围为1.75 mm Al至>10 mm Al。与根管内充填材料的最低要求相比，较低的范围似乎不足以进行常规临床检测。
由于根端充填材料种类繁多，射线不透性范围广泛，迫切需要一项规定所需最低射线不透性以及其他性能的国际标准。它应以体外研究结果和大规模临床X线摄影调查为基础。
