A-8 各種矯正用Ni-Ti合金線の通電熱処理法による機械的特性の変化について(チタン・チタン合金,一般講演(口頭発表),第54回日本歯科理工学会学術講演会)

概要

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It has been widely known that heat treatment is required to bend orthodontic Ni-Ti alloy wires. Recently, direct electric resistance heat treatment equipments used to bend the Ni-Ti wire in orthodontic clinics. In this study, twenty-three commercial orthodontic Ni-Ti wires were examined for two factors: 1. Necessary heat treatment time for forming and 2. Changing of mechanical properties by heat treatment wires. The latter was examined using the three points bending test. As a result, we found that heat treatment time required for the formation into required shapes for all samples were 3〜5 seconds. Furthermore, the equipment utilizing electric resistance of the various Ni-Ti alloy wires had an effect on load in the super-elastic regions, stress hysteresis, and stiffness.
2009-09-10