Cook W D
Aust Dent J. 1981 Apr;26(2):105-12. doi: 10.1111/j.1834-7819.1981.tb02443.x.
The radiopacity of 33 commercially available composite materials was measured in terms of their equivalent thickness of an aluminum alloy per unit thickness of material. The theoretical significance of this definition was discussed. The radiopacities were found to vary by more than an order of magnitude. Although nearly 30 percent of the materials have radiopacities less than dentine, all materials claimed to be radiopaque were more so than dentine. The influence of operating potential, specimen thickness, X-ray generator type, film type, filtration and X-ray dose were investigated. The former two factors were found to have a large influence on the radiopacity.
以每单位材料厚度的铝合金等效厚度来测量33种市售复合材料的射线不透性。讨论了该定义的理论意义。发现射线不透性的变化超过一个数量级。虽然近30%的材料射线不透性低于牙本质，但所有声称具有射线不透性的材料都比牙本质的射线不透性更强。研究了操作电位、试样厚度、X射线发生器类型、胶片类型、过滤和X射线剂量的影响。发现前两个因素对射线不透性有很大影响。
