McArthur D R, Taylor D F
Oral Surg Oral Med Oral Pathol. 1975 Feb;39(2):329-38. doi: 10.1016/0030-4220(75)90236-4.
It was hoped that it might be possible to establish some standard or starting point which could be used by future investigators to judge adequate levels of radiopacity of radiopaque denture-base materials. Aluminum and copper were used to define a suitable radiopacity scale. The scale was represented by two sets of specimens--one of regular outline and uniform thickness, the other of irregular shape and tapering thickness. Radiographs of the chest and abdominal regions of a cadaver were exposed, with the specimens placed on the film side and then on the opposite side of the cadaver. The results showed that it was more difficult to locate the beveled irregular specimens, that there was little difference between the chest and the abdomen with respect to ease of locating the same objects, and that the closer an object is to the film the easier it is to locate. For 95 per cent observability, an object should have a level of radiopacity at least equal to that produced by 0.20 mm. of copper.
人们希望有可能建立某种标准或起点，供未来的研究人员用于判断不透射线义齿基托材料的适当不透射线性水平。铝和铜被用来定义一个合适的不透射线性量表。该量表由两组标本表示——一组是轮廓规则且厚度均匀的，另一组是形状不规则且厚度逐渐变细的。将标本放置在尸体胸部和腹部区域的X光片一侧，然后再放置在尸体的另一侧进行曝光。结果表明，定位有斜边的不规则标本更困难，在定位相同物体的难易程度方面，胸部和腹部之间几乎没有差异，并且物体离胶片越近就越容易定位。为了达到95%的可观察性，一个物体的不透射线性水平应至少等于0.20毫米铜所产生的不透射线性水平。
