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目的:比较传统的一次最大前伸法Twin-block矫治器与改良逐步式前移下颌的Twin-block矫治器治疗下颌后缩畸形的临床疗效。方法:选择处于替牙晚期或恒牙早期ANB角>5°,覆盖>6mm的骨性下颌后缩患者13例,接受逐步式前移下颌的TB矫治器治疗,根据病例对照的原则收集使用传统一步法TB矫治器治疗的病例13例作为对照组,应用X线头影测量技术进行治疗前后的18项硬组织测量分析。结果:逐步式TB矫治器治疗后SNB角增大,Y轴角变小,下颌颏部相对颅底位置关系变化明显,MP-SN、FH-MP增大改善深覆。两组矫治后磨牙调整为中性关系或轻度近中关系,前牙覆覆盖基本正常;上下颌关系协调。结论:传统式Twin-block矫治器和逐步式Twin-block功能矫治器早期治疗安氏II类1分类下颌后缩患者,疗效基本相同,但改良式Twinblock矫治器患者戴用舒适度好,可优先考虑之。
OBJECTIVE: To compare the clinical effect of the traditional maximal prolapse Twin-block appliance and the Twin-block appliance with progressive progressive mandibular advancement for the treatment of mandibular reconstruction. Methods: Thirteen patients with skeletal mandibular retrusion in the late stage of tooth replacement or early permanent dentition with ANB angle> 5 ° and covered> 6 mm were treated with TB appliance with progressive mandibular advancement. The patients were selected according to the principle of case control One-step TB appliance treatment of the 13 cases as a control group, the application of X-cephalometry before and after treatment of 18 hard tissue measurement analysis. Results: The step-by-step TB appliance treatment increased SNB angle, Y axis angle smaller, mandibular chin position relative to the skull base changes significantly, MP-SN, FH-MP increased to improve the deep overburden. Two groups of orthodontics were adjusted to neutral or mild near-medium molar relationship, the anterior cover covered basically normal; upper and lower jaw coordination. CONCLUSIONS: The effects of conventional Twin-block appliances and progressive Twin-block appliance on early treatment of Class II-1 mandibular retrusion patients were similar, but modified Twinblock appliance was preferred for comfort and comfort Consider it.