Kanazawa Manabu, Iwaki Maiko, Minakuchi Shunsuke, Nomura Naoyuki
Assistant Professor, Gerodontology and Oral Rehabilitation, Department of Gerontology and Gerodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Assistant Professor, Gerodontology and Oral Rehabilitation, Department of Gerontology and Gerodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
J Prosthet Dent. 2014 Dec;112(6):1441-7. doi: 10.1016/j.prosdent.2014.06.017. Epub 2014 Sep 23.
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.
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.
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.
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 α 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.
The mechanical properties and microstructure of the denture frameworks prepared by selective laser melting indicate that these dentures are appropriate for clinical use.
铸造困难导致钛在牙科修复体中的应用受限。选择性激光熔化系统最近被开发用于由钛合金制造生物医学部件。然而，通过选择性激光熔化制造上颌全口义齿的钛合金框架尚未得到研究。
本研究的目的是使用选择性激光熔化系统制造上颌全口义齿的薄钛合金框架，并评估其硬度和微观结构。
用牙科三维锥形束计算机断层扫描系统对上颌无牙颌模型进行扫描，并使用DICOM Viewer（医学数字成像和通信）生成标准三角测量语言数据。使用三维计算机辅助设计软件设计两种类型的全口义齿金属框架。根据这些设计，使用选择性激光熔化系统制造了两个钛合金框架，SLM-1和SLM-2。从SLM-1、SLM-2和铸态Ti-6Al-4V（铸态）的中央平坦区域切割出板状试样。进行了维氏硬度测试、光学显微镜观察和X射线衍射测量。
通过选择性激光熔化可以制造上颌全口义齿的薄钛合金框架。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，试样未出现孔隙，表明通过选择性激光熔化工艺成功获得了致密的框架。在X射线衍射图谱中，SLM-1和SLM-2仅观察到与α相相关的峰。此外，SLM-1和SLM-2的晶格参数略大于铸态试样。
通过选择性激光熔化制备的义齿框架的力学性能和微观结构表明，这些义齿适用于临床应用。
