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目的 :观察Herbst矫治器对生长期AngleⅡ类错牙合患者牙牙合、颅面产生的影响。方法 :选取 16例青春生长期的安氏Ⅱ类错牙合患者采用全牙弓整体支抗的带环式Herbst矫治器进行治疗 ,通过治疗前后的头影测量片对比 ,分析该矫治器的疗效。结果 :1)所有患者面型均改善 ,磨牙关系均达Ⅰ类或接近Ⅲ类 ,覆盖和覆牙合明显减小。 2 )矢状方向上 ,SNB增加 ,ANB减小 ,表现为下切牙唇倾 ,上切牙唇倾度减小 ,下颌磨牙近中移动 ,而上颌磨牙无明显远中移动。在覆盖改变量中骨的改变占 5 5 .5 6 % ,在磨牙关系改变量中骨的改变占 5 6 .4 5 %。 3)垂直方向上 ,腭平面及下颌平面均无变化 ,而牙合平面顺时针旋转 ,上颌切牙及下颌磨牙升长 ,上颌磨牙与下颌切牙无明显压低 ,下面高增加。 4 )下颌骨的长度增加。 5 )软组织侧貌突度减小。结论 :1)Herbst矫治器能迅速、有效地矫治AngleⅡ类错牙合 ;2 )颌间关系的改善是骨骼、牙牙合效应共同作用的结果 ;3)该矫治器能促进下颌骨的生长 ,改善面部高度不足
OBJECTIVE: To observe the effect of Herbst appliance on occlusal and craniofacial changes in Angle Ⅱ malocclusion patients in growing stage. Methods: Twenty-six patients with Class Ⅱ malocclusion in youth were enrolled in this study. Herbst appliance was used to treat the whole arch of the arch with a ring, and the curative effect of the appliance was analyzed by comparing the cephalometric measurement before and after treatment . Results: 1) All the patients' facial features improved, the relationship between molars reached Ⅰ or nearly Ⅲ, the coverage and overbite significantly reduced. 2) In the sagittal direction, SNB increased and ANB decreased. The performance of the lower incisors lip inclination, upper incisor lip inclination decreased, mandibular molars near the middle, while the maxillary molars no significant distance. Changes in the coverage of the changes in bone accounted for 55.65%, changes in the molar relationship between bone changes accounted for 56.45%. 3) In the vertical direction, there was no change in the plane of the palatal and the mandibular plane, while the plane of the occlusal rotation turned clockwise. The maxillary incisor and mandibular molar grew longer. 4) The length of the mandible increases. 5) soft tissue profile reduce the suddenness. Conclusions: 1) The Herbst appliance can quickly and effectively correct the Angle Ⅱ malocclusion; 2) the improvement of the intermaxillary relationship is the result of the joint action of the skeletal and occlusal effects; 3) The appliance can promote the growth and improvement of the mandible Face height is not enough