FABRICATION OF TITANIUM ALLOY FRAMEWORKS FOR COMPLETE DENTURES BY SELECTIVE LASER MELTING
FABRICATION OF TITANIUM ALLOY FRAMEWORKS FOR COMPLETE DENTURES BY SELECTIVE LASER MELTING
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DOI：
10.1016/j.prosdent.2014.06.017
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发表时间：
2014-12-01
影响因子：
4.6
通讯作者：
Nomura, Naoyuki
中科院分区：
文献类型：
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作者：
Kanazawa, Manabu;Iwaki, Maiko;Nomura, Naoyuki
陈述问题。铸造困难导致钛在牙科修复体中的使用有限。选择性激光熔化技术是近年来发展起来的一种用于钛合金生物医用材料制备的新技术。然而，通过选择性激光熔化来制造用于上颌全口义齿的钛合金框架尚未进行研究。本研究的目的是利用选择性激光熔化系统制作上颌全口义齿用钛合金薄支架，并对其硬度和显微结构进行评价。使用牙科三维锥形束计算机断层扫描系统扫描无牙上颌骨的模型，并使用DICOM查看器（医学数字成像和通信）生成标准三角测量语言数据。应用三维计算机辅助设计软件设计两种全口义齿金属支架。利用选择性激光熔化系统从这些设计中制备了两种钛合金框架，SLM-1和SLM-2。从SLM-1、SLM-2和铸态Ti-6Al-4V（铸态）的中心平坦区域切割板状试样。进行维氏硬度测试、光学显微镜和X射线衍射测量。采用选择性激光熔化技术可制备薄型钛合金上颌全口义齿支架。SLM-1和SLM-2的硬度值高于铸态试样。SLM-1和SLM-2微观结构的光学显微镜图像显示，样品没有表现出孔隙，表明致密的框架，成功地获得了选择性激光熔融过程。在X射线衍射图中，对于SLM-1和SLM-2仅观察到与α相相关的峰。另外，SLM-1和SLM-2的晶格参数略大于铸态合金。激光熔化法制备的义齿支架的力学性能和显微结构表明，该义齿支架适合于临床应用。
Statement of problem. Casting difficulties have led to the limited use of titanium in dental prostheses. The selective laser melting system was recently developed to fabricate biomedical components from titanium alloys. However, the fabrication of a titanium alloy framework for a maxillary complete denture by selective laser melting has not yet been investigated.Purpose. The purpose of the study was to fabricate thin titanium alloy frameworks for a maxillary complete denture with a selective laser melting system and to evaluate their hardness and microstructure.Material and methods. A cast of an edentulous maxilla was scanned with a dental 3-dimensional cone-beam computed tomography system, and standard triangulation language data were produced with the DICOM Viewer (Digital Imaging and Communications in Medicine). Two types of metal frameworks for complete dentures were designed with 3-dimensional computer-aided design software. Two titanium alloy frameworks, SLM-1 and SLM-2, were fabricated from these designs with the selective laser melting system. Plate-shaped specimens were cut from the central flat region of SLM-1, SLM-2, and as-cast Ti-6Al-4V (As-cast). Vickers hardness testing, optical microscopy, and x-ray diffraction measurements were performed.Results. Thin titanium alloy frameworks for maxillary complete dentures could be fabricated by selective laser melting. The hardness values for SLM-1 and SLM-2 were higher than that for the as-cast specimen. Optical microscopy images of the SLM-1 and SLM-2 microstructure showed that the specimens did not exhibit pores, indicating that dense frameworks were successfully obtained with the selective laser melting process. In the x-ray diffraction patterns, only peaks associated with the a phase were observed for SLM-1 and SLM-2. In addition, the lattice parameters for SLM-1 and SLM-2 were slightly larger than those for the as-cast specimen.Conclusions. The mechanical properties and microstructure of the denture frameworks prepared by selective laser melting indicate that these dentures are appropriate for clinical use.