Chen Jianyu, Luo Chongdai, Zhang Chunyu, Zhang Gong, Qiu Weiqian, Zhang Zhiguang
Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University & Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China.
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Zhonghua Kou Qiang Yi Xue Za Zhi. 2014 Oct;49(10):625-30.
To design and fabricate the custom-made titanium mandibular condyle by the reverse engineering technology combined with selective laser melting (SLM) technology and to explore the mechanical properties of the SLM-processed samples and the application of the custom-made condyle in the temporomandibular joint (TMJ) reconstruction.
The three-dimensional model of the mandibular condyle was obtained from a series of CT databases. The custom-made condyle model was designed by the reverse engineering software. The mandibular condyle was made of titanium powder with a particle size of 20-65 µm as the basic material and the processing was carried out in an argon atmosphere by the SLM machine. The yield strength, ultimate strength, bending strength, hardness, surface morphology and roughness were tested and analyzed. The finite element analysis (FEA) was used to analyze the stress distribution.
The complex geometry and the surface of the custom-made condyle can be reproduced precisely by the SLM. The mechanical results showed that the yield strength, ultimate strength, bending strength and hardness were (559±14) MPa, (659±32) MPa, (1 067±42) MPa, and (212±4)HV, respectively. The surface roughness was reduced by sandblast treatment.
The custom-made titanium condyle can be fabricated by SLM technology which is time-saving and highly digitized. The mechanical properties of the SLM sample can meet the requirements of surgical implant material in the clinic. The possibility of fabricating custom-made titanium mandibular condyle combined with the FEA opens new interesting perspectives for TMJ reconstruction.
采用逆向工程技术结合选择性激光熔化（SLM）技术设计并制造定制钛下颌髁突，探讨SLM加工样品的力学性能以及定制髁突在颞下颌关节（TMJ）重建中的应用。
从一系列CT数据库中获取下颌髁突的三维模型。通过逆向工程软件设计定制髁突模型。以粒径为20 - 65 µm的钛粉为基础材料制作下颌髁突，并在氩气气氛中由SLM机器进行加工。对屈服强度、极限强度、弯曲强度、硬度、表面形貌和粗糙度进行测试分析。采用有限元分析（FEA）分析应力分布。
SLM能够精确再现定制髁突的复杂几何形状和表面。力学结果表明，屈服强度、极限强度、弯曲强度和硬度分别为（559±14）MPa、（659±32）MPa、（1067±42）MPa和（212±4）HV。通过喷砂处理降低了表面粗糙度。
SLM技术可制造定制钛髁突，省时且高度数字化。SLM样品的力学性能能够满足临床手术植入材料的要求。结合FEA制造定制钛下颌髁突的可能性为TMJ重建开辟了新的有趣前景。
