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The European Journal of Orthodontics 1988 10(1):187-191; doi:10.1093/ejo/10.1.187
© 1988 by European Orthodontic Society
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Japanese NiTi alloy wire: use of the direct electric resistance heat treatment method

Fujio Miura1, Masakuni Mogi and Yoshiaki Ohura

Tokyo Medical and Dental University Japan

1Professor Fujio Miura First Department of Orthodontics Tokyo Medical and Dental University 1-5-45 Yushima, Bunkyo-ku Tokyo 113 Japan

Japanese nickel titanium (NiTi) alloy wire possesses excellent spring-back properties, shape memory and super-elasticity. In order to adapt this wire to clinical use, it is necessary to bend as well as to control its super-elastic force, and so a direct electric resistance heat treatment (DERHT) method was developed. An electric current is passed directly through the wire, thus generating enough heat to make it possible to bend it as well as to impart a change in the super-elastic force of the wire. With this DERHT method, the excellent spring-back properties of the wire are not diminished, and it is possible to apply an optimal force to each tooth with a single archwire.


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