BONDING IN ORTHODONTICS - Part 1

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BONDING IN ORTHODONTICS - Part 2

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Stainless steel and its Application

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Orthodontic Wires

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NITINOL

·        Invented in early 60’s by Wiliam F Buc-hler

·        Developed for the space program (Ni,nickel; Ti, titanium; NOL, Naval Ordnance Laboratory)

Composition

·        Nickel-55%

·        Titanium-45%

·        Have two remarkable properties - shape memory and superelasticity.

·        Exist in more than one form or crystal structure.

·        The martensite  form exists  at lower temperatures

·        Austenite form at higher temperatures

·        Shape memory and superelasticity are related to phase transitions within the NiTi alloy between the martensitic and austenitic forms that occur at relatively low transition temperature.

·        Shape memory refers to the ability of the material to "remember" its original shape after being plastically deformed while in the martensitic form.

·        In a typical application,a certain shape is set while the alloy is maintained at an elevated temperature, above the martensite-austenite transition temperature.