New evaluation method by microfocus radiograph CT for 3D assessment of internal adaptation of all-ceramic crowns
New evaluation method by microfocus radiograph CT for 3D assessment of internal adaptation of all-ceramic crowns
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DOI：
10.4012/dmj.24.362
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发表时间：
2005-09-01
影响因子：
2.5
通讯作者：
Yatani, H
中科院分区：
文献类型：
--
作者：
Wakabayashi, K;Sohmura, T;Yatani, H
本研究的目的是评价微焦点X线摄影CT系统在三维和非破坏性检查全瓷冠的适合性的有效性。采用微焦点X线CT拍摄牙冠和基牙模型的计算机断层图像。利用体绘制软件，提取间隙图像并进行三维重建，分析其体数据。为了与传统方法进行比较，将适合性测试硅糊剂夹在基牙和全瓷冠之间。然后对牙冠在基牙模型上的适应性进行三维非破坏性观察。此外，可以在任意位置分析间隙。关于平均间隙厚度，两种测量方法之间存在显著差异。不过，很轻微。因此，我们得出结论，微焦点X线摄影CT系统是一个非常有效的方法，在检查全瓷冠的适应性。
The aim of this study was to evaluate the effectiveness of the microfocus radiograph CT system in examining the adaptation of all-ceramic crowns three-dimensionally and non-destructively. The computed tomograms of the crown and abutment model were filmed by microfocus radiograph CT. Using a volumetric rendering software, images of gaps were extracted and reconstructed three-dimensionally, and their volume data analyzed. In order to compare this method with the conventional method, fitness test silicone paste was sandwiched between the abutment and all-ceramic crown. Adaptation of the crown on the abutment model was then observed non-destructively and three-dimension ally. Furthermore, the gaps could be analyzed in any arbitrary position. Concerning mean gap thickness, there was significant differences between the two measurement methods. However, it was very slight. We therefore concluded that the microfocus radiograph CT system is well positioned to be an extremely effective method in examining the adaptation of all-ceramic crowns.