论文部分内容阅读
目的对下颌后缩型安氏Ⅱ类错畸形的患者用功能矫治进行矫治,观察矫治前后的牙、颌结构变化。方法用双垫功能矫治器(twin-block)对15例下颌后缩型安氏Ⅱ类Ⅰ分类患者进行矫治,分析比较矫治后的头颅侧位片。结果患者除SWA角无明显变化外,SNB角增大,ANB角减小,前牙的覆盖(is/r-ii/r)减小,磨牙关系(ms/Y-mi/Y)在矢状方向变化明显。结论对于下颌后缩型安氏Ⅱ类Ⅰ分类错畸形患者应在早期用功能矫治器进行第一期治疗,主要纠正骨骼的矢状关系不调。第二期用固定矫正器,对牙位及关系作精细调整。
Objective To treat patients with mandibular retrusion type Ⅱ malocclusion by functional orthodontic treatment and to observe the changes of dental and maxillary structures before and after orthodontic treatment. Methods Fifteen patients with mandibular retrusion type Ⅱ division Ⅰ malocclusion were treated with twin-block. The cephalometric images were compared and analyzed. Results In addition to no significant changes in SWA angle, the SNB angle increased, the ANB angle decreased, the anterior teeth coverage (is / r-ii / r) decreased and the molar relationship (ms / Y-mi / The direction of change is obvious. Conclusions For patients with mandibular retrusion type Ⅱ division Ⅰ malocclusion, the first phase of treatment should be performed with functional appliance in the early stage, mainly to correct the unsmooth sagittal relationship of the skeleton. The second phase with a fixed appliance, the relationship between teeth and 作 fine adjustment.