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目的探讨Activator、FR-Ⅱ、Step-by-step Twin-block功能矫治器矫治安氏Ⅱ类错牙合畸形患者引起下颌支抗丧失的差异。方法选择36例骨性安氏Ⅱ类Ⅰ分类错牙合患者,根据患者的年龄、性别、治疗前的投影测量数据配对治疗组,分成Activator功能矫正器组(Activator组)、FR-Ⅱ型功能矫正器组(FR-Ⅱ组)、Step-by-step Twin-block功能矫正器组(Step-by-step Twin-block组)。每组12例,同时招募符合条件的志愿者12例,作为对照组。治疗组和对照组患者分别在治疗前后拍头颅侧位片并进行比较。结果 Activator组患者上切牙唇倾度无改变,FR-Ⅱ组患者维持了上颌骨和上切牙原来的位置,上颌的生长发育无明显的改变,而Step-by-step Twin-block组患者上前牙伸长,上前牙突度改变主要是上前牙内倾。3组均对上磨牙具有远中移动作用,均引起下前牙唇倾,与对照组比较差异有统计学意义(P<0.05)。结论无论是一步法导下颌向前的功能矫治器Activator、FR-Ⅱ型矫治器还是Step-by-step Twin-block矫治器均引起下颌牙列支抗丧失。
Objective To investigate the differences of mandibular support loss in patients with Class Ⅱ malocclusion treated with Activator, FR-Ⅱ and Step-by-step Twin-block appliance. Methods 36 cases of skeletal Class Ⅱ division Ⅰ malocclusion were selected. The patients were divided into Activator group, Activator group and FR-Ⅱ group according to their age, sex and pre-treatment projection measurement data. (FR-II group), Step-by-step Twin-block group (Step-by-step Twin-block group). Twelve patients in each group were enrolled, and 12 eligible volunteers were recruited as control group. The patients in the treatment group and the control group were compared before and after treatment. Results In the Activator group, there was no change in the incisors’ incisors. The FR-Ⅱ group maintained the original position of the maxilla and the incisors without any significant changes in maxillary growth. However, patients in the Step-by-step Twin-block group Elongation on the teeth, anterior teeth on the main changes in the intensity of the anteversion. All three groups had a far-to-mid-shift effect on the upper molars, both of which caused anterior lip declining, which was significantly different from the control group (P <0.05). Conclusion Both mandibular anterior mandibular activator, FR-Ⅱ appliance or Step-by-step Twin-block appliance lead to the loss of mandibular dentition support.