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Which of the following materials used in orthodontics commonly causes sensitivity?

 # Which of the following materials used in orthodontics commonly causes sensitivity?
A. Steel
B. Ceramic
C. Nickel
D. Plastic



The correct answer is C. Nickel.

Most allergies in orthodontics are related to latex and nickel. Nickel can evoke IgE-mediated (immediate) and cell-mediated (delayed) hypersensitivity reactions. 

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