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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Effects of protraction mechanics on the midface.
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Effects of protraction mechanics on the midface.

机译：拉伸机制对中间面的影响。

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摘要

Forty patients with Class III maxillary deficiencies were each treated with a bonded maxillary palatal expansion appliance followed by protraction. Nineteen of the 40 patients were retained with a Frankel III appliance. This group was compared with 24 Class I patients treated solely with bonded expansion appliance mechanotherapy. To determine at which level protraction mechanics affects the maxilla, the Walker's analysis and other cephalometric measurements were used. The protraction group showed significant increases (p <.05) in the following measurements: ANB angle, Wits, A perpendicular to nasion and in sella to A point. Anterior molar movement, without changes in posterior nasal spine or upper incisor to SN, was evident (p <.05). Favorable change in the facial profile was noted. There were no changes in the angles between sella-nasion and its relationship with the Frankfurt, occlusal, palatal, and mandibular planes. Walker's analysis showed no change in the position of orbitale. The control group did not demonstrate any significant changes in the position of the maxillary complex as a result of expansion mechanics. The retention group maintained the position of the maxilla postprotraction. Facial contour was maintained and other profile related variables improved.
机译：40例III类上颌骨缺损的患者，均采用粘结的上颌pa骨扩张器治疗，然后进行牵引。 40名患者中有19名保留了Frankel III矫治器。将这组患者与24例仅接受键合扩展矫治器机械治疗的I类患者进行比较。为了确定牵伸力学影响上颌的水平，使用了Walker分析和其他头颅测量方法。延长组在以下测量中显示显着增加（p <.05）：ANB角度，Wits，垂直于鼻孔的A和蝶鞍至A点。前磨牙运动明显，无后鼻脊柱或上切牙到SN的变化（p <.05）。注意到面部轮廓发生有利变化。蝶鞍与其与法兰克福，牙合，pa骨和下颌骨的关系之间的角度没有变化。沃克的分析表明，轨道的位置没有变化。对照组没有显示出上颌复合体的位置因扩张机制而发生任何显着变化。保留组保持上颌后伸的位置。保持面部轮廓，改善其他与轮廓有关的变量。

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