Department of Oral and Maxillofacial Radiology, Tokyo Dental College.
Department of Mechanical Engineering, Keio University.
Dent Mater J. 2024 Sep 28;43(5):656-666. doi: 10.4012/dmj.2024-023. Epub 2024 Aug 9.
The geometrical accuracy of additively manufactured pure titanium clasps depends on the building orientation. The aim of this study is to compare the geometrical accuracy and the fatigue lives predicted by finite element analysis (FEA) among three clasps manufactured with different building orientations. Besides, this paper proposed a calculation method of the moment of inertia of area and cross-sectional area along with the arm as the geometrical parameters. One of the clasps manufactured with a cylindrical chucking part for the fatigue test had almost the same geometrical parameters with the CAD design. Also, the authors' fatigue life prediction method using the CAD based FEA was verified through comparison with micro-CT image-based FEA. The other two clasps had larger geometrical parameters than the CAD design, resulting in longer fatigue lives. The results implied the importance of calculating the moment of inertia of the area in the design of the clasp arm.
增材制造纯钛卡环的几何精度取决于构建方向。本研究的目的是比较三种不同构建方向制造的卡环的几何精度和有限元分析（FEA）预测的疲劳寿命。此外，本文提出了一种计算沿臂的面积和横截面面积的转动惯量的计算方法，作为几何参数。其中一个带有圆柱形卡盘部分的卡环用于疲劳测试，其几何参数与 CAD 设计几乎相同。此外，作者使用基于 CAD 的 FEA 的疲劳寿命预测方法通过与基于微 CT 图像的 FEA 的比较得到了验证。另外两个卡环的几何参数比 CAD 设计的大，导致疲劳寿命更长。结果表明，在卡环臂的设计中计算面积的转动惯量非常重要。
