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目的:采用Johnston分析法评价下颌前伸矫治器(SUS2)矫治安氏II类错牙合的效果。方法:应用SUS2配合MBT矫治器矫治安氏Ⅱ类错牙合、下颌后缩病例22例(男9例,女13例,年龄13~17岁),X线头影测量比较治疗前后的咬合关系和软组织面型,上下颌骨与牙齿的矢状位置变化。结果:矫治后覆牙合、覆盖和磨牙关系均达到正常,面部软组织凸度和上下唇距审美平面有显著改善,SNB明显增加,ANB显著减小(P<0.05〉);上下颌骨和牙齿在矢状方向上移动明显,上颌骨前移0.99 mm,下颌骨前移4.30 mm,上下颌骨相对位置改变了3.32 mm(P<0.001);上磨牙及上切牙相对上颌骨分别后移0.12 mm、0.60 mm,下磨牙及下切牙相对下颌骨分别前移1.02 mm、1.41 mm(P<0.001),磨牙关系(U6/L6)改变了4.46 mm(P<0.001),前牙覆盖(U1/L1)改变了5.33 mm(P<0.001)。结论:SUS2配合MBT矫治器使下颌相对上颌发生明显前移,从而改善咬合关系和软硬组织面型;矫治过程中骨骼变化量明显大于牙齿变化量,SUS2矫治效果主要由骨骼变化引起。
OBJECTIVE: To evaluate the effect of mandibular advancement (SUS2) on Class II malocclusion using Johnston’s analysis. Methods: Twenty-two cases of mandibular retrusion (including 9 males and 13 females, aged 13-17 years) were treated with SUS2 combined with MBT appliance in the treatment of Class Ⅱ malocclusion. X-cephalometry was used to compare the occlusal relationship before and after treatment Soft tissue surface, upper and lower jaw and the sagittal position of the teeth changes. Results: The relationship of overbite, covering and molars were all normal. The facial soft tissue crown and upper and lower lips were significantly improved from the aesthetic level, SNB increased significantly, ANB decreased significantly (P <0.05) The maxillary shift was 0.99 mm, the mandibular advance was 4.30 mm, the relative position of the maxilla and mandible was changed by 3.32 mm (P <0.001), and the posterior molar shift was 0.12 mm, and 0.60 mm respectively. The relative molars of mandibular molars and mandibular incisors moved 1.02 mm and 1.41 mm respectively (P <0.001), while molars (U6 / L6) changed 4.46 mm (P <0.001) L1) changed by 5.33 mm (P <0.001). CONCLUSIONS: In combination with MBT appliance, the maxillary mandibular movement was significantly advanced by SUS2 combined with MBT appliance, thereby improving the occlusal relationship and the soft and hard tissue surface. The skeletal change was significantly greater than that of the tooth during orthodontic treatment. The effect of SUS2 treatment was mainly caused by skeletal changes.