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目的 介绍Tweed Merrifield定向力原理 ,探讨其在治疗安氏II类I分类错牙合的临床机理。方法 通过评价临床治疗的 10例安氏II类I分类错牙合病例 ,介绍改进的Tweed Merrifield矫治方法及步骤 ,并分析矫治中使用的力系 ,同时介绍一典型病例的治疗过程及治疗结果。结果 表明正确应用Tweed Merrifield原理在临床上能成功治疗安氏II类I分类错牙合。结论 方丝弓是一种有效的矫治安氏II类I分类错牙合的固定矫治器 ,只要在治疗中正确应用Tweed Merrifield原理 ,掌握好力的使用及支抗的控制 ,疗效非常显著
Objective To introduce the principle of Tweed Merrifield directional force and to explore its clinical mechanism in the treatment of Class Ⅱ division I malocclusion. Methods Ten cases of Class II malocclusion with Class I malocclusion were evaluated. The improved methods and procedures of Tweed Merrifield correction were introduced. The force system used in orthodontic treatment was analyzed. The treatment process and treatment outcome of a typical case were also introduced. The results show that the correct application of the principle of Tweed Merrifield clinically successful treatment of Class II Class I malocclusion. Conclusion Square wire arch is an effective fixator for Class II malocclusion of Class II malocclusion. As long as the Tweed Merrifield principle is correctly applied in the treatment, good use and control of the brachial plexus can be mastered. The curative effect is very significant