KAIST, Department of Nuclear and Quantum Engineering, Daejeon, 34141, Republic of Korea.
Guidance Dental, Buena Park, California, 90621, USA.
Sci Rep. 2017 Mar 15;7:44577. doi: 10.1038/srep44577.
The objective of this study was to demonstrate the feasibility of using micro-CT scan of dental impressions for fabricating dental restorations and to compare the dimensional accuracy of dental models generated from various methods. The key idea of the proposed protocol is that dental impression of patients can be accurately digitized by micro-CT scan and that one can make digital cast model from micro-CT data directly. As air regions of the micro-CT scan data of dental impression are equivalent to the real teeth and surrounding structures, one can segment the air regions and fabricate digital cast model in the STL format out of them. The proposed method was validated by a phantom study using a typodont with prepared teeth. Actual measurement and deviation map analysis were performed after acquiring digital cast models for each restoration methods. Comparisons of the milled restorations were also performed by placing them on the prepared teeth of typodont. The results demonstrated that an efficient fabrication of precise dental restoration is achievable by use of the proposed method.
本研究旨在展示利用口腔印模的微计算机断层扫描（micro-CT）来制作牙科修复体的可行性，并比较各种方法生成的牙科模型的尺寸精度。该方案的关键思想是，患者的口腔印模可以通过微计算机断层扫描进行精确数字化，并且可以直接从微计算机断层扫描数据制作数字模型。由于口腔印模微计算机断层扫描数据中的空气区域相当于真实的牙齿和周围结构，因此可以对这些空气区域进行分割，并以 STL 格式制造数字模型。该方法通过使用备有牙齿的仿头模型进行的体模研究得到了验证。对每种修复方法获取数字模型后，进行了实际测量和偏差图分析。还将铣削修复体进行了比较，将它们放置在仿头模型的备牙上。结果表明，通过使用该方法可以实现精确牙科修复体的高效制作。
