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目的 探讨改良Nance弓的支抗作用及其特点。方法 以原Nance弓为基础 ,弓丝两端设计“U”型曲 ,并通过两侧磨牙带环水平舌侧管结扎固定而发挥支抗作用。结果 该装置具有控制支抗磨牙近中舌侧扭转、近中倾斜移动 ,控制牙弓宽度 ,并根据矫治需要可以随时调整、灵活掌握支抗大小等特点。结论 改良活动式Nance弓较原Nance弓具有更多的优点 ,是一种有效的增强支抗的辅助装置。
Objective To explore the function and characteristics of the improved Nance arch. Methods Based on the original Nance arch, the “U” curve was designed at both ends of the archwire, and the anchoring effect was exerted by ligating and fixing the horizontal lingual tube of molar band on both sides. Results The device has the control of anti-molar near the lingual side of the twist, near and tilt to move, control dental arch width, and according to the needs of the correction can be adjusted at any time, flexibility to grasp the characteristics of the size of the support. Conclusion The modified active Nance arch has more advantages than the original Nance arch and is an effective auxiliary device to enhance the support.