Damon-Ⅲ自锁托槽矫治安氏Ⅱ类2分类错牙合畸形患者下颌位置及面部比例的变化

摘要

BACKGROUND: Self-locking brackets straight wire appliance is a kind of low fraction and light force correction technique. The combination of self-locking brackets without ligation and high-performance elastic arch wire provide revolutionary change of the efficient correction and fixed orthodontic technique on the clinical treatment. OBJECTIVE: To investigate the changes of mandibular position and facial ratio of patients with angle class division 2 Ⅱmalocclusion by Damon-Ⅲ self-locking brackets technique. METHODS: The sample was consisted of 13 patients with angle class division 2 malocclusion treated by traditional Roth Ⅱstraight wire appliance and 13 patients with angle class divisiⅡon 2 malocclusion treated by Damon- selfⅢ-locking brackets technique. The pre-and after-treatment cephalometric films were measured to assess the treatment effect. RESULTS AND CONCLUSION: After treatment, the sella-nasion-point A (SNA) angle was increased in Damon- selfⅢ-locking brackets group and Roth straight wire appliance group, and the sella-nasion-point B (SNB) angle was decreased. It indicated that the mandible in two groups changed significantly in sagittal direction, and had the trend to increase in vertical. Compared with the self-locking brackets group after treatment, the lower mandible had the clockwise trend and the increasing of the mandibular posterior alveolar was not obvious (P < 0.05), the lower incisors inclined was obvious (P < 0.05). The study showed that the changes of the lower mandible and facial proportion caused by the Damon- selfⅢ-locking brackets combined with occlusal guide plate+Class Ⅱ traction was more obvious than the changes caused by Roth straight wire appliance combined with occlusal guide plate+Class Ⅱ traction, and had the favorable regulation on the lower incisors inclination.%背景:自锁托槽直丝弓矫治技术是一种低摩擦轻力矫治技术,其无需结扎的自锁托槽与高性能的弹性弓丝的结合使用,带来了临床的高效矫治和固定正畸技术革命性的改变.目的:探讨Damon-Ⅲ自锁托槽矫治技术治疗安氏Ⅱ类2分类错(牙合)畸形患者治疗前后的硬组织变化.方法:选择采用Damon-Ⅲ自锁托槽矫治技术和Roth直丝弓矫治技术治疗的安氏Ⅱ类2分类错(牙合)畸形患者各13例,治疗前后拍摄患者头颅侧位X线片并进行测量.结果与结论:Damon-Ⅲ自锁组和Roth直丝组治疗后蝶鞍点-鼻根点-上牙槽座点角增大,下牙槽座点角减小,说明治疗后上下颌矢状向的不调得到了纠正;治疗后与自锁组比较,直丝组下颌有顺时针旋转趋势,下后牙升高量不明显(P < 0.05),下前牙唇倾较明显(P < 0.05).提示Damon-Ⅲ自锁托槽配合平面导板+Ⅱ类牵引引起下颌及面部比例的改变比直丝弓托槽配合平面导板+Ⅱ类牵引更明显,在下前牙唇倾度上有良好的控制.