Yoneyama T, Doi H, Kobayashi E, Hamanaka H
Department of Metallurgy, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Japan.
Front Med Biol Eng. 2000;10(2):97-103. doi: 10.1163/15685570052061955.
The super-elasticity of Ti-Ni alloy was investigated in tensile and bending tests to evaluate the mechanical properties of the castings and heat treatment effect on the bending properties of the wires for new clinical applications of the alloy in prosthodontics and orthodontics. In terms of the tensile properties of the castings, apparent proof stress increased and elongation decreased with the small increase in nickel content or with the decrease in titanium purity. This result suggests that precise control of the materials is indispensable to utilize the super-elasticity in dental cast appliances. In terms of the bending properties of Ti-Ni alloy wires, low residual deflection and small load/deflection ratio were obtained by the second heat treatment between 733 and 813 K, which was found to be suitable for the shape memory treatment of orthodontic appliances. Moreover, the functional force was changeable within this treatment temperature range.
在拉伸和弯曲试验中研究了Ti-Ni合金的超弹性，以评估铸件的力学性能以及热处理对合金在口腔修复学和正畸学新临床应用中金属丝弯曲性能的影响。就铸件的拉伸性能而言，随着镍含量的小幅增加或钛纯度的降低，表观屈服应力增加而伸长率降低。该结果表明，精确控制材料对于在牙科铸造器械中利用超弹性是必不可少的。就Ti-Ni合金丝的弯曲性能而言，通过在733至813 K之间进行二次热处理，获得了低残余挠度和小的载荷/挠度比，这被发现适用于正畸器械的形状记忆处理。此外，在该处理温度范围内，功能力是可变的。
