Hoshi Isao, Kawai Tadashi, Kurosu Shingo, Minamino Tadaharu, Onodera Kei, Miyamoto Ikuya, Yamada Hiroyuki
Division of Oral and Maxillofacial Surgery, School of Dentistry, Iwate Medical University, 19-1, Uchimaru, Morioka 020-8505, Iwate, Japan.
Department of Elementary Material Process Technology, Iwate Industrial Research Institute, 2-4-25, Kitaiioka, Morioka 020-0857, Iwate, Japan.
Materials (Basel). 2021 Nov 1;14(21):6556. doi: 10.3390/ma14216556.
Mandibular reconstruction using a titanium mesh tray and autologous bone is a common procedure in oral and maxillofacial surgery. However, there can be material problems-such as broken titanium mesh trays-which may undermine long-term functionality. This study was designed to investigate the optimal conditions for a titanium mesh tray with an ideal mandibular shape and sufficient strength, using computer-aided design, computer-aided manufacturing technology, and electron beam additive manufacturing. Specimens were prepared using Ti-6Al-4V extra low interstitial titanium alloy powder and an electron beam melting (EBM) system. The mechanical strength of the plate-shaped specimens was examined for differences in the stretch direction with respect to the stacking direction and the presence or absence of surface treatment. While evaluating the mechanical strength of the tray-shaped specimens, the topology was optimized and specimens with a honeycomb structure were also verified. Excellent mechanical strength was observed under the condition that the specimen was stretched vertically in the stacking direction and the surface was treated. The results of the tray-shaped specimens indicated that the thickness was 1.2 mm, the weight reduction rate was 20%, and the addition of a honeycomb structure could withstand an assumed bite force of 2000 N. This study suggests that the EBM system could be a useful technique for preparing custom-made titanium mesh trays of sufficient strength for mandibular reconstruction by arranging various manufacturing conditions.
使用钛网托盘和自体骨进行下颌骨重建是口腔颌面外科的常见手术。然而，可能会出现材料问题，如钛网托盘断裂，这可能会损害长期功能。本研究旨在利用计算机辅助设计、计算机辅助制造技术和电子束增材制造，研究具有理想下颌骨形状和足够强度的钛网托盘的最佳条件。使用Ti-6Al-4V超低间隙钛合金粉末和电子束熔化（EBM）系统制备标本。检查了板状标本在拉伸方向上相对于堆叠方向以及是否存在表面处理的机械强度差异。在评估托盘状标本的机械强度时，对拓扑结构进行了优化，并验证了具有蜂窝结构的标本。在标本沿堆叠方向垂直拉伸且表面经过处理的条件下，观察到了优异的机械强度。托盘状标本的结果表明，厚度为1.2毫米，减重率为20%，添加蜂窝结构可以承受2000牛的假定咬合力。本研究表明，通过安排各种制造条件，EBM系统可能是一种用于制备具有足够强度的定制钛网托盘以进行下颌骨重建的有用技术。
