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附件对于矫正上颌第二前磨牙扭转是必不可少的。矫治器单步扭转矫正增量超过 1° 可能会产生较大的力矩。垂直矩形附件在扭转矫正中表现最佳;然而,它们引起的副作用也最多。最后,尽管无附件的前磨牙扭转矫正副作用最少,但其效率并不高。
Ferlias et al. (Wed,) 对该问题进行了研究。
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