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目的 :评价Twinbock矫治骨性Ⅱ类错引起的硬组织变化 ,探讨其矫治机制。方法 :选择 2 0例骨性Ⅱ类错患者 ,男 8例 ,女 12例 ,平均年龄 11.5岁。Twinbock矫治前后拍摄头颅侧位片 ,进行X线头影测量 ,以计算机统计分析。结果 :平均疗程 8个月 ,X线头影测量结果的改变主要为SNB角增大 2 .83° ,ANB减小 2 .2 5°,下切牙唇倾 ,下颌体长 (Go Gn)增大 ,覆盖减小。结论 :在生长发育期应用Twinbock矫治器治疗 ,可刺激下颌生长 ,使下颌后缩的Ⅱ类面型得到明显改善
OBJECTIVE: To evaluate the changes of hard tissue induced by Twinbock in the treatment of skeletal Class Ⅱ malocclusion and to explore its mechanism of correction. Methods: Twenty patients with skeletal Class Ⅱ malocclusion were selected, including 8 males and 12 females, with a mean age of 11.5 years. Twinbock before and after filming cranial lateral radiographs, X-ray Cephalometric measurement to computer statistical analysis. Results: The average course of treatment was 8 months. The changes of X-cephalometry were mainly the increase of SNB angle by 2.83 °, the decrease of ANB by 2.52 °, the lip incision of lower incisors and the increase of mandibular body length (Go Gn) Coverage is reduced. Conclusion: The Twinbock appliance in growth and development can stimulate the growth of the mandible, so that the mandibular retrusion Ⅱ class was significantly improved