Method for localized heat treatment of orthodontic wires

Details Method for localized heat treatment of orthodontic wires Method for localized heat treatment of orthodontic wires

A - Human Necessities

61

C

A61C 3/00 (2006.01)

Patent

CA 2635921

A method for localized heat treatment of a region of an orthodontic wire (20) employs a hot air source (30) having a maximum flow rate of approximately 6 - 10 liters per minute to selectively heat a small region of the wire (20) above a predetermined temperature to change its metallurgical properties while the wire (20) is held in a desired shape by an instrument (10) or fixture. After the wire (20) has been maintained at temperature for the required period of time, it can be released and allowed to cool. For example, these capabilities are well-suited for shape-setting localized regions of austenitic Ni-Ti wire and for stress-relieving and normalizing heavily-worked stainless steel wire.

Procédé de traitement thermique localisé d~une région d~un fil orthodontique (20) employant une source d~air chaud (30) présentant un débit maximal d~environ 6 - 10 litres par minute pour chauffer de manière sélective une petite région du fil (20) au-dessus d~une température prédéterminée pour changer ses propriétés métallurgiques tandis que le fil (20) est maintenu dans une forme désirée par un instrument (10) ou un dispositif de serrage. Une fois que le fil (20) a été maintenu à température pour le laps de temps requis, on peut le libérer et le laisser refroidir. Par exemple, ces capacités conviennent particulièrement au conformage de régions localisées de fil de Ni-Ti austénitique et au soulagement des contraintes et à la normalisation de fil en acier inoxydable fortement usiné.

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