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目的观察应用铸造式快速扩弓矫治安氏Ⅱ类Ⅰ分类边缘病例的临床疗效,为正畸临床使用这一扩弓装置提供依据,以丰富安氏Ⅱ类Ⅰ分类边缘病例的非拔牙矫治经验。方法对15例安氏Ⅱ类Ⅰ分类边缘病例采用铸造式上颌扩弓配合直丝弓矫治技术进行非拔牙正畸治疗。分别在正畸治疗前后进行头影测量和模型分析。结果应用铸造式快速扩弓并结合直丝弓技术矫治后,ANB角减小1.5°,U1-SN角减小8.7°;6-6、4-4、3-3牙间宽度分别平均扩大5.6mm、4.3mm、3.9mm。结论铸造式快速扩弓器能有效的扩宽上牙弓解除拥挤和内收前牙,同时也协调了上下牙弓的大小,解除狭窄的上牙弓对下颌骨的限制,下颌骨有一定的近中移位,对解除下颌后缩,纠正深覆牙合、深覆盖,协调面型有重要作用。
Objective To observe the clinical curative effect of cast rapid protraction in treatment of Class Ⅱ division Ⅰ marginal cases and to provide basis for orthodontic use of this expansion device in order to enrich the non-extractive treatment experience of Class Ⅱ division Ⅰ margins. Methods Fifteen patients with Class Ⅱ division Ⅰ edge were treated with cast maxillary expansion combined with straight wire appliance for non - extraction orthodontic treatment. Cephalometric measurement and model analysis were performed before and after orthodontic treatment. Results After cast rapid protraction combined with straight wire arch technique, the ANB angle decreased by 1.5 ° and the U1-SN angle decreased by 8.7 °. The interdental widths of 6-6, 4-4 and 3-3 increased by 5.6 mm, 4.3mm, 3.9mm. Conclusion Casting rapid protractors can effectively widen the maxillary arch crowding and adducing the anterior teeth, but also coordinate the size of the upper and lower dental arch, the lifting of the upper arch of the narrow restrictions on the mandible, the mandible has a certain Near the shift, to lift the mandibular retrusion, correction of deep overbite, deep coverage, coordination of surface type has an important role.