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Research on the clinical application of a dental magnetic attachment

牙科磁性附着体的临床应用研究

基本信息

批准号：
01480459
负责人：
TANAKA Yoshinobu
金额：
$ 4.16万
依托单位：
Aichi-Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01480459/
关键词：
Magnet Dental magnetic attachment Magnetic analysis Magnetic cricuit Closed magnetic circuit Denture retainer Laser welding Rare earth magnet レ-ザ-溶接光弾性応力分布ビデオレ-ザ-変位計根面アタッチメント希土類磁石

项目摘要

Several types of dental magnetic attachment are commercially available at the moment, however none of them are clinically satisfactory. One problem is that they are too large, otherwise the retentive force is too weak. Furthermore, most of them do not have enough corrosion resistance, which is a crucial point in clinical use. A very small and powerful attachment has been developed by devicing a sandwich typed construction and the elliptic cross-section with aid of three dimentional FEM analysis. The attachment is sealed with a stainless steel cap laser-welded to the yoke. It has shown sufficient attractive force and stability in clinical trials. A photoelastic simulation model was fabricated to study the continuous stress distribution in the mucous membrane and the bone under a free- end typed removable partial denture. Our originally developed magnetic attachment was compared with other conventional retainers such as the O-ring attachment, wire clasp and Bear attachment. The photoelastic fringes produced when the vertical loads were applied on the canti-lever denture saddle, were continuously by video system and serial photos.Although a final conclusion has not been determined, it was clarified by this research that a dental magnetic attachment which belongs to quite new category of denture retainers, showed the same mechanical attitude as other retainers. That means the magnetic attachment can be clinically used without any special anxieties. This new attachment of which commercial name is "MAGFIT 600" has benn put on the market in August 1992 as the first domestic product in Japan.This research should be followed by the three-dimentional dynamic analysis by FEM technique to establish a basic principle to determine the actual clinical undications.

目前市面上有几种类型的牙科磁性附件，但没有一种在临床上令人满意。一个问题是它们太大，否则保持力太弱。此外，它们大多数不具备足够的耐腐蚀性，这是临床使用的关键点。在三维有限元分析的帮助下，通过设计三明治型结构和椭圆形横截面，开发出了一种非常小而强大的附件。该附件通过激光焊接到轭架上的不锈钢盖进行密封。在临床试验中表现出足够的吸引力和稳定性。制作了光弹性模拟模型来研究自由端型可摘局部义齿下粘膜和骨骼中的连续应力分布。我们最初开发的磁性附件与其他传统固定器（例如 O 形圈附件、线扣和熊附件）进行了比较。通过视频系统和系列照片连续记录在悬臂义齿鞍座上施加垂直载荷时产生的光弹性条纹。虽然最终结论尚未确定，但本研究阐明，牙科磁性附着体属于新型义齿保持器类别，表现出与其他保持器相同的机械姿态。这意味着磁性附件可以在临床上使用而无需任何特殊的担忧。这种新型附件的商品名为“MAGFIT 600”，于1992年8月作为日本国内第一款产品上市。本研究应通过FEM技术进行三维动态分析，以建立确定实际临床适应症的基本原理。