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有关牙种植体骨周围骨整合前后关系的骨改变的医学文献报告最初都局限于一维骨高度缺损的定量研究。虽然数字化和CT可准确定量骨的变化,但只能从表面上反映形态变化,而不能反映成骨活动的动态变化。 骨扫描可以准确地反映成骨活动,但由于重叠的原因,不可能进行准确的定量分析。单光子发射断层摄影(single photon emission computerized tomogra-phy,SPECT)通过移出临床非兴趣区而得到额外的、精确的二维图像和进行准确的定量测定,可用于包括骨骼系统在内的多个器官系统。还可通过静脉注射放射性药物,在组织或器官内形成放射性活性分布的三维表现,用旋转伽玛照相机拍摄,获得的图像经计算机处理,进行矢状和冠状的重建。 本研究用SPECT对无牙颌患者钛种植体种植前后骨变化情况进行定量分析,以了解骨动态变化的本质,同时也作为一种客观评价方法来监测种植
The medical literature on bone changes in the relationship between anterior and posterior osseointegration of dental implants was initially confined to the quantitative study of one-dimensional bone defect. Although digitization and CT can accurately quantify bone changes, they can only reflect the morphological changes from the surface, but can not reflect the dynamic changes of osteogenic activity. Bone scans accurately reflect osteogenic activity, but accurate quantification is not possible due to overlap. Single photon emission computerized tomogra-phy (SPECT) can be used for multiple organs, including the skeletal system, by obtaining extra, accurate two-dimensional images by moving out of the clinical non-interest zone and making accurate quantitative measurements system. Radiosopharmaceuticals can also be injected intravenously to form three-dimensional representations of radioactive activity in tissues or organs, which are taken with a rotating gamma camera. Images obtained are computerized for sagittal and coronal reconstruction. In this study, SPECT was used to quantitatively analyze bone changes before and after implantation of titanium implants in patients with edentulous jaws so as to understand the nature of bone dynamic changes and to monitor the implantations as an objective evaluation method