REMOVABLE MAGNETIC KEEPER FREE FROM MRI ARTIFACT

可拆卸的磁性保持器，免受 MRI 伪影的影响

• 批准号: 06671946
• 负责人: NAKAMURA Kazuo
• 金额: $ 1.22万
• 依托单位: TOKYO MEDICAL AND DENTAL UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06671946/
• 关键词: REMOVABLE MAGNETIC KEEPER; DENTAL MAGNETIC ATTACHMENT; MRI; ARTIFACT; ア-ティファクト; 可撤式キ-パ-; 磁性アタッチメント

Dental magnetic attachments are one of the intraoral atattiments and consist of two parts, the magnetic assembly and the magnetic keeper. Both parts are made by magnetic substances and these materials can cause MRI artifact, when they are used in the imaging field. The magnetic assembly are usually mounted in the prosthesis, so the magnetic assembly are easily kept away from the imaging field by removing the prosthesis. But the keeper is casted within the root cap cemented in the root, and it can be a artifact of the MRI.The aims of this investigation were to develope the removable magnetic keeper, and to make sure the efficiency of the removable magnetic keeper clinically.1.Removable magnetic keeper assemblyThe removable magnetic keeper assembly consists of a magnetic keeper and a nonmagnetic housing. The magnetic keeper is a disk with a screw-shaped lateral wall or a bolt-shaped disk. The housing is a nut-shaped ring. The magnetic keeper is screwed into the housing and fixed tightly. In the clinical evaluation, the patients was comprised of 28 partially edentulous subjects, 17 women and 11men, provided with dental magnetic attachments with the removable keeper. They were followed up for 0.5-3 years. During this period, none of these removable keepers were dropped out and all of them were kept clean and they coould be easily removed.2.Influence on MRIA volunteer test subject with combinations of keepers in lower premolar region was examined by MRI.The images of the magnetic removable keeper and the housing were defective and showed same size of distortion as the ordinary keeper, but the images of the housing only , where the keeper was removed , showed no distortion.

牙齿磁性附件是口腔内的一种，由两个部分组成，分别是磁性组件和磁性守护者。这两个部分都是由磁性物质制成的，这些材料在成像场中使用时可能会导致MRI伪像。磁组件通常安装在假体中，因此通过去除假体来容易远离成像场。但是守门员被铸造在根帽内，可以是MRI的伪像。这项调查的目的是开发可移动的磁性守护者，并确保可移动的磁性机器人临床上可移动的磁性机器人的效率。1.Explablesable磁台机器组件可重新振动的磁性守护者组成的磁性储物固定器包含磁性的磁性储物，并具有磁性的磁性。磁性守护机是带有螺钉形侧壁或螺栓形圆盘的磁盘。外壳是坚果形的环。磁性守护者被拧入外壳并固定。在临床评估中，患者由28位部分倾听的受试者，17名女性和11名男子组成，并配备了可移动门将的牙齿磁性附着。他们进行了0.5 - 3年的跟踪。在此期间，这些可移动的守护者都没有退出，所有这些都保持干净，并且可以轻松地移除。2。在MRIA志愿者测试对象中，MRI的较低前磨牙的守护者的组合被MRI检查了。磁移动守护者的图像是有缺陷的，房屋的扭曲和与普通的保存者相同，但在居住的情况下显示了相同的位置。

项目成果

中村 和夫,水谷 紘,ほか: "磁性合金の補綴領域における応用 第8報 ネオジム磁石を応用した磁性アッタチメント" 日本補綴歯科学会雑誌. 34 94特別号. 139 (1995)

Kazuo Nakamura、Hiro Mizutani 等人：“磁性合金在修复领域的应用第 8 部分：使用钕磁铁的磁性附件”日本修复医学会杂志 34 94 特刊（1995 年）。

H.Mizutani,K.Nakamura,et al.: "Influence of Thermal Cycle on Attractive Force of Magnetic Attachment." J Dent Res. 74. 471 (1995)

H.Mizutani,K.Nakamura,et al.：“热循环对磁性附着吸引力的影响”。