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	Computer-aided design and manufacturing of dental implants with irregular geometries
	Chen, Jianyu; Chen, Xianshuai; Zhang, Xiao; Eichstädt, Olaf; Du, Ruxu; Deng, Feilong; Zhang, Zhiguang
	2014
会议名称	3rd International Conference on Biodental Engineering, BIODENTAL 2014
会议地点	Porto, Portugal
英文摘要	Introduction: In current medical practice, osseointegrated cylindrical dental implants are considered a safe and reliable option to replace missing teeth among the edentulous and partially edentulous patients. However, numerous geometric designs of dental implants have been proposed and studied in order to resolve some remaining issues in the clinic. For example, tapered implants or implants closely imitating the root geometries found in nature ("root-analogue") were designed for immediate implant placement. Short implants have been introduced as a potential alternative to bone grafting procedures in patients with limited alveolar bone height. Dental implants with porous structure were designed to mimic the trabecular bone and enhance a better osseointegration. However, these irregular geometric designs of the unconventional dental implants are extremely difficult to fabricate by traditional computer numerical control machining method. Hence, the purpose of this study is to explore the possibility of manufacturing implants with irregular geometry by using Selective Laser Melting (SLM) technology, also known as metal 3-D printing, from CAD data. The study also addresses the question of how to predict performances of individual dental implants by means of numerical simulation. Material and methods: Geometric models of four implant geometries were designed by using Computer- Aided Design (CAD) software: (1) root-analogue implant, (2) tapered implant, (3) short implant and (4) porous-structured short implant. The CAD models were fed to a SLM125HL machine (SLM solutions GmbH). Commercial pure grade-2 Ti powder (particle diameter range 20-65 μm) with spherical shape was used as raw material for the printing process. The SLM laser processing parameters were a laser scanning velocity of 275 mm/s, a hatch distance of 130 μm, and layer thickness of 30 μm for a laser power of 100 W. The morphology and the surfaces roughness of the samples were measured. For the simulation, a digital model of a human maxillary bone block derived from a series of computer tomography images and virtually assembled with the models of the different dental implants. The von Mises stress magnitude and distribution around the bone-implant interfaces were calculated by using finite element analysis (ANSYS). All materials used in the models were considered isotropic, homogeneous and linearly elastic. Results: In a comparison of different implant designs by finite element analysis, the tapered implant shows similar von Mises stresses in the implant-bone interfaces as the root-analogue implant. For the case of the short implants, the porous implant exhibits a more favourable stress distribution in the trabecular bone than the solid implant. The four different dental implants with irregular geometries were successfully produced by the SLM 3D printing technology and were found essentially consistent with their designs. The small design features, such as threads and pores, were free of distortion and defect. The sample surfaces with about 4.3 μm micro-roughness display a granulated appearance unique to the SLM process. Conclusions: The SLM 3D printing technology is able to build dental implants with irregular shapes starting from digital CAD data. In addition to refining the manufacturing method it is now also necessary to explore different designs and simulation workflows and to validate the results by experiments.
收录类别	EI
语种	英语
内容类型	会议论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/6284]
专题	深圳先进技术研究院_南沙所
作者单位	2014
推荐引用方式 GB/T 7714	Chen, Jianyu,Chen, Xianshuai,Zhang, Xiao,et al. Computer-aided design and manufacturing of dental implants with irregular geometries[C]. 见:3rd International Conference on Biodental Engineering, BIODENTAL 2014. Porto, Portugal.

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