Hasegawa Aki, Shinya Akikazu, Lassila Lippo V J, Yokoyama Daiichiro, Nakasone Yuji, Vallittu Pekka K, Shinya Akiyoshi
Department of Crown and Bridge, The Nippon Dental University School of Life Dentistry at Tokyo, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.
Odontology. 2013 Jul;101(2):210-5. doi: 10.1007/s10266-012-0076-z. Epub 2012 Jun 23.
The aim of this study is to evaluate the accuracy of dental ceramic object three dimensional (3D) finite element model constructed directly from two different dental cone beam computed tomography (CT) systems. CT scanned one 10.0 × 10.0 × 20.0 mm block and one 8.0 × 10.0 × 40.0 mm block of an 8-step wedge. All 3D finite element (FE) models were created from CT images. Each 3D FE model measured the length of the directions X, Y, and Z that corresponded to an original specimen using the measurement function between two points on the Mechanical Finder software package. The measurements and practical value were compared with the CT image and the accuracy of the reproduced measurements was examined. No significant differences were found between Alphard-3030 on the Z axis and ProMax 3D on the Y axis of the block. In addition, there were also no significant differences observed between Alphard-3030 on the Y axis and ProMax 3D on the X axis compared with Alphard-3030 on the Z axis and ProMax 3D on the Y axis for the step-wedge. The results suggest that measurement of the dimensions of cone beam CT images could be useful in applications where both good reproducibility and accuracy of FE models are required.
本研究的目的是评估直接从两种不同的牙科锥形束计算机断层扫描（CT）系统构建的牙科陶瓷物体三维（3D）有限元模型的准确性。CT扫描了一个8步楔形的10.0×10.0×20.0mm块和一个8.0×10.0×40.0mm块。所有3D有限元（FE）模型均从CT图像创建。每个3D FE模型使用Mechanical Finder软件包上两点之间的测量功能测量与原始标本相对应的X、Y和Z方向的长度。将测量值和实际值与CT图像进行比较，并检验再现测量的准确性。在块体的Z轴上的Alphard - 3030和Y轴上的ProMax 3D之间未发现显著差异。此外，对于楔形块，与Z轴上的Alphard - 3030和Y轴上的ProMax 3D相比，Y轴上的Alphard - 3030和X轴上的ProMax 3D之间也未观察到显著差异。结果表明，在需要FE模型具有良好再现性和准确性的应用中，测量锥形束CT图像尺寸可能会很有用。
