TMA Wire Formability — NDEB AFK MCQ

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ModerateOrthodonticsTMA Wire FormabilityNDEB AFK

Which of the following orthodontic wires has the highest formability (ability to be bent into complex shapes) and is therefore ideal for detailed finishing adjustments?

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Correct answer: E — Beta-titanium (TMA)

Beta-titanium (TMA — titanium molybdenum alloy) has the highest formability of commonly used orthodontic wires, meaning it can be bent into complex shapes (loops, stops, offsets, torque bends) without fracturing. It delivers moderate forces (between NiTi and SS), has good springback, and excellent corrosion resistance. These properties make it ideal for finishing and detailing stages of orthodontic treatment, where precise bends are needed to achieve final tooth positions. NiTi has superelastic properties but very low formability (fractures when bent sharply). SS has good formability but delivers high forces.

Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019