Frnkel矫治器治疗早期骨性Ⅱ类错的八因素初步分析

An Eight-factor Analysis of Early Skeletal Class Ⅱ Malocclusion Using Frnkel Appliance

目的 :探讨安氏 类 1分类骨性错经 FR- 、 型矫治器治疗前后八因素变化。方法 :对 17例安氏 类 1分类骨性错患者经 FR- 、 型矫治器治疗前后进行 X线头影测量 ,分析对比治疗前后八因素的改变。结果 :FR矫治器可促进髁突的前下生长 ,均使下颌体、下颌支增长 ,颅底角减小以及上颌骨向前旋转 ,有利于 类错的矫治 ,但该矫治器不能很好地控制上颌骨的矢状向和垂直向的生长发育 ,以及后部齿槽高度的生长。结论 :FR矫治器最适于治疗上颌发育基本正常而下颌发育不足的 类患者 ,不宜用于上颌发育过度和垂直生长型的患者。

Objective: To investigate the change of eight factor after Frnkel appliance treatment in skeletal class Ⅱ malocclusions. Methods: X ray cephalometric film. Results: Frnkel appliance can be used to enhance the growth of ramus (Factor 2) and body (Factor 1) of the mandible, decrease the angle of cranial base (Factor 8) and made the maxilla rotate (Factor 4) anteriorly, which were benifit to the treatment of class Ⅱ malocclusion. However, neither the vertical (Factor 5) and sagittal (Factor 3) growth of maxilla nor the height of posterior alveolar bone (Factor 6) can be inhibited by use of Frnkel appliance. Conclusion: Frnkel appliance is suitable to the treatment of class Ⅱ patients with deficient mandible and almost normal maxilla, while Frnkel appliance would rather not be used for patients with overgrown maxilla or vertical growth pattern.