Sewerin I P
Department of Radiology, Royal Dental College, Copenhagen.
Clin Oral Implants Res. 1991 Jan-Mar;2(1):20-3. doi: 10.1034/j.1600-0501.1991.020102.x.
Identity of film positioning and of X-ray beam angulation is essential for valid comparisons of marginal bone height around osseointegrated implants. The purpose of the present study was to analyze the possibilities of estimating fixture angulation in relation to film plane from the threads of Brånemark fixtures. 10 observers compared 62 images of fixtures with angulations ranging from 0 degrees to +/- 15 degrees with a set of reference radiographs. Out of 620 recordings, 29% were right, and 71% differed by greater than or equal to 1 degree. The observers distinguished with great accuracy between negative and positive angulations. 81% of the recordings differed by 2 degrees or less. It is concluded that the threads of Brånemark fixtures are helpful in controlling the identity of serial radiographs of implants. The test circumstances were ideal compared to clinical cases, and it is possible that accuracy will be less in patient cases.
对于骨结合种植体周围边缘骨高度的有效比较而言，胶片定位和X射线束角度的一致性至关重要。本研究的目的是分析根据Brånemark种植体的螺纹来估计种植体相对于胶片平面角度的可能性。10名观察者将62张角度范围为0度至±15度的种植体图像与一组参考X线片进行比较。在620次记录中，29%正确，71%的差异大于或等于1度。观察者能够非常准确地区分负角度和正角度。81%的记录差异在2度或更小。结论是，Brånemark种植体的螺纹有助于控制种植体系列X线片的一致性。与临床病例相比，测试环境是理想的，在患者病例中准确性可能会降低。
