Construction of the dental attachment manufacturing system made from the Fe-Pt-Nb magnetic alloy by CAD/CAM

利用CAD/CAM构建Fe-Pt-Nb磁性合金牙科附着体制造系统

基本信息

批准号：
14370624
负责人：
KASAHARA Shin
金额：
$ 8.64万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

项目摘要

New prosthetic appliances composed of outer and inner crowns, each made of Fe-39.5mol%Pt-0.75mol%Nb magnetic alloy and magnetic stainless steel, have been developed. The Fe-Pt-Nb magnet has high energy product almost equivalent to the Sm-Co magnet, and excellent corrosion resistance. Kanno et al. showed the possibility of dental casting of the Fe-Pt magnet alloy. However, there remains a problem that the magnetic properties of the Fe-Pt-Nb magnetic alloy are very sensitive to the thermal history of the casting process.Good grindability is desirable in magnetic alloys for clinical use. Furthermore, if the magnetic alloys could be readily machined by a dental CAD/CAM system, it would be possible to avoid problems related to melting the material, which are inevitable when casting. In this study, the grindability of the cast Fe-Pt-Nb magnetic alloy and the magnetic stainless steel was evaluated and compared with that of conventional dental casting alloys. Furthermore, using the integral el … More ement method, the 3-dimensional magnetic field of the outer and inner cap model were analyzed to determine the optimal method for the design and magnetization of removable crown and bridge system made of the Fe-Pt magnet.CONCLUSION1. There was no significant difference in the grinding rate between the solution treated and aged Fe-Pt-Nb magnetic alloys at 500 m min^<-1>. However, the grinding rate of aged Fe-Pt-Nb magnetic alloy was significantly lower at the higher grinding speeds.2. It was found that the grinding rate of the aged Fe-Pt-Nb magnetic alloy and the stainless steel were higher than those of conventional casting alloys at lower speed.3. When the thickness of outer cap top was 1.5mm and the length of outer cap side was 4.0-3.5mm, the optimum attractive force were obtained clinically.4. The attractive force of model-1 was more excellent than that of model-2.5. When the occlusal vertical dimension of the molar was low, it was suggested that the thickness of outer cap top was more important than the length of outer cap side in both models. Less

已开发出由 Fe-39.5mol%Pt-0.75mol%Nb 磁性合金和磁性不锈钢组成的新型外冠和内冠。Fe-Pt-Nb 磁体具有几乎与磁能相当的高磁能积。 Kanno等人展示了Fe-Pt磁体合金的牙科铸造的可能性，但Fe-Pt-Nb磁体合金的磁性能仍然存在问题。对铸造过程的热历史非常敏感。临床使用的磁性合金需要良好的可磨性。此外，如果磁性合金可以通过牙科 CAD/CAM 系统轻松加工，则可以避免与熔化相关的问题在这项研究中，对铸造铁铂铌磁性合金和磁性不锈钢的可磨性进行了评估，并与传统牙科铸造合金进行了比较。元素法，分析了外盖和内盖模型的三维磁场，以确定由Fe-Pt磁体制成的可摘冠桥系统的设计和磁化的最佳方法。结论1．固溶处理和时效的Fe-Pt-Nb磁性合金在500 m min^-1>然而，时效的Fe-Pt-Nb磁性合金的磨削速率在较高磨削下显着降低。 2.当外盖顶部厚度为1.5mm时，时效后的Fe-Pt-Nb磁性合金和不锈钢的磨削速率高于传统铸造合金。外盖边长为4.0-3.5mm，获得了临床上的最佳吸引力。4．在磨牙咬合垂直尺寸上，模型1的吸引力优于模型2.5。较低，表明在两个模型中外盖顶部的厚度比外盖侧面的长度更重要。