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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.
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