Utilization of the hollow orthodontic super-elastic materials possessing anisotropy

用于医用导管的空心超弹性钛镍合金丝（空心丝）比传统的超弹性钛镍合金丝提供更低和更连续的正畸力。此外，通过将其他线插入中空芯中来复合线，可以部分地和可逆地用作负载可变正畸线。另一方面，这种线的横截面可以比较容易地改变。如果可以改变中空线的横截面，则可以使正畸力取决于方向。将这种各向异性的力应用于临床，可以使牙齿移动更加有效。本研究的目的是设计一种最佳的空心丝截面形状变换方法，以检测各向异性的正畸力，并用于临床。因此，我们提出了一种直接变换的方法，使空心丝截面形状变换成为可能。 关于我们 乐同时，通过悬臂梁和三点弯曲试验的验证，可以获得各向异性的正畸力，因为在多托槽系统中使用的正畸丝不仅弯曲而且扭转，实际正畸力可以不同于单独测试获得的弯曲和扭转载荷。因此，在施加各向异性力之前，为了研究性能，我们制作了三点弯曲和扭矩同步试验装置进行试验。结果表明，通过扭转和弯曲变形的结合，获得了独特的载荷特性，该试验装置可用于进一步评价载荷特性，目前已开始在临床医学中应用。此外，我们还打算利用同步试验装置研究各向异性载荷特性，这项研究的一部分已在2005年第五届国际钛研讨会上发表。牙科（千叶），第60届和第61届日本正畸学会年会（东京，名古屋）。少

Hollow super-elastic Ti-Ni alloy wire (hollow wire) produced for the application of medical catherter tubing delivered much lower and more continuous orthodontic force than do conventional super-elastic Ti-Ni alloy wires. Also, compound wires by inserting other wires into hollow core, it became possible to apply partially and reversibly as a load-variable orthodontic wire.On the other hands, the cross-section of this wire can be changed with comparative ease. If it becomes possible to transform the hollow wire cross-section, the orthodontic force could be made dependent on direction. By using such anisotropic force in clinical orthodontics, it can make more efficient tooth movement achievable. The purpose of this research was to device a methood for optimal transforming the cross-section, to examine anisotropic orthodontic force, and to utilize for clinical orthodontics.So we developed the direct transforming method, and transformation of the cross-section of the hollow wire was possib … More le. Also, as a verified by cantilever and three-point bending test, it became possible to obtain anisotropic orthodontic force.Because orthodontic wires using in a multi-bracket system was not only bent also twisted simultaneously, actual orthodontic force can be different from bending and toruquing load obtaind from individual test. Thereupon, before the application of anisotropic force, to investigate properties we produced three-point bending and torque synchronized test apparatus of trial. As a result, by combining twisting with bending deflection, unique load properties was obtained, this test apparatus was supposed available for further evaluation of the load properties.And now we have started to apply this hollow wire in clinical orthodontics, furthermore we intend to investigate anisotropic load properties by using the synchronized test apparatus.A part of this research was reported in the 5th International Symposium on Titanium in Dentistry (Chiba), the 60th and 61th Annual meeting of the Japanese orthodontic Society (Tokyo, Nagoya). Less