改良片段弓技术压低上前牙对深覆牙合矫治效果的临床观察

摘要

目的：探讨改良片段弓技术压低上前牙对深覆牙合矫治的临床疗效及其作用机制。方法：选择15例前牙深覆牙合患者，采用直丝固定矫治器结合改良片段弓技术打开其咬合，通过X线头影测量分析患者矫治前、后前牙深覆牙合的改变情况，评价其治疗效果。结果：患者治疗后上前牙获得垂直向压入，前牙咬合打开，深覆牙合得到矫治，后牙垂直向及矢状向无明显变化。结论：改良片段弓技术能压低前牙段，同时控制后牙段的伸长，有利于深覆牙合特别是高角、露龈笑或成年深覆牙合患者的矫治；其压低辅弓适宜的初始加载力值为50g左右。%Objective To assess the clinical effect of intrusive anterior teeth in overbite patients by improved segment arch. Methods Select 15 patients with overbite of anterior teeth, they all treated by fixed orthodontic appliance and improved segment arch. Measure the changes of anterior and posterior teeth through the cephalometric and clinical examination.Results The anterior teeth were intruded vertically, and the posterior teeth change litter in vertically and horizontally. When the initial loading force of improved segment arch was 50g, it can achieve appropriate intrusion of anterior teeth.Conclusion Under an appropriate intrusive force,improved segment arch can effectively intrude incisors and control the extrusion of posterior teeth. It can be used to correct the deep overbite, especially with high mandibular planes,gummy smile or adult patients.