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目的 :研究AngleⅡ1 错牙合患者颌面硬组织特征 ,找出适合这一特征的合理对症治疗方法。方法 :利用头颅侧位定位X线片 ,通过正常牙合者与AngleⅡ1 错牙合患者 13项分析指标的比较研究 ,找出AngleⅡ1 患者的骨性变异特征。结果 :在矢状骨性关系方面 ,AngleⅡ1 错牙合组较正常牙合组SNB角、SL距明显减小 ,ANB角显明增大、而SNA角及PNS ANS距无明显差异 ;在骨性垂直关系方面 ,AngleⅡ1 错牙合组较正常牙合组UM PP距及LM MP距均明显减小 ,UI PP距明显增大 ,而LI PP距没有明显差异 ;在下颌骨生长方向方面SN MP角均明显减少。结论 :该类畸形具有后部牙槽高度不足 ,下颌后缩及下颌骨的逆时针旋转生长倾向。提示此类患者的治疗适于采取能使下颌向前、下移位的方法 ,才能取得对症治疗的良好疗效
Objective: To study the characteristics of maxillofacial hard tissue in AngleⅡ1 malocclusion patients and to find a reasonable symptomatic treatment method suitable for this feature. Methods: According to the comparative study of 13 indexes of the patients with Angle Ⅱ 1 malocclusion by the cephalometric X-ray films, the skeletal variation characteristics of Angle Ⅱ 1 patients were determined. Results: In the sagittal bony relationship, Angle Ⅱ1 malocclusion group than the normal occlusion group SNB angle, SL distance was significantly reduced, ANB angle was significantly increased, while the SNA angle and PNS ANS distance was no significant difference in the bony vertical Relationship, Angle Ⅱ 1 malocclusion group compared with normal occlusal group UM PP distance and LM MP distance were significantly reduced, UI PP distance was significantly increased, while there was no significant difference between the LI PP; in the growth direction of the mandible SN MP angle obviously decrease. Conclusion: This type of deformity possesses the posterior alveolar height deficiency, mandibular retrusion and mandible rotation counterclockwise growth. Tips for the treatment of such patients is suitable to take the mandibular forward, down shift method, in order to obtain a good effect of symptomatic treatment