Relationship between A_f Temperature and Load Changes in Ni-Ti Orthodontic Wire under Different Thermomechanical Conditions

概要

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Simple three point bending tests were performed on Ni-Ti wires with three different A_f points (1℃, 13℃ and 34℃) to clarify the relationship between A_f temperature and load changes under constant deformation. Each wire was deformed at 37℃ and then thermal changes were imposed by temperatures of 2℃ or 60℃. The load changes with thermal changes from 37℃ to 2℃ or 60℃ showed the same tendency on the wires with different A_f points: In the loading stage, the load became lower than the initial level at 37℃ and in the unloading stage, the load became higher than the initial load. The largest load change in the unloading stage was measured with the l3℃ A_f point wire. Care must be taken when handling Ni-Ti wire with an A_f point of less than 1℃ in order to prevent it from reaching the limit of critical stress of slip deformation when the temperature in the mouth rises to above 40℃.
日本歯科理工学会の論文