【摘要】 目的:探讨牵引弓联合前方牵引对矫治安氏Ⅲ类错牙合的牙性和骨性影响。方法:选择 17例替牙期安氏Ⅲ类错牙合患者,牵引弓联合前方牵引治疗前牙反牙合,矫治开始及前后各 6个月拍头颅侧位片进行头影测量分析。结果: 17例患者在治疗期内均发生上颌骨前移,下颌骨轻度向下后旋转:SNA平均增大 2. 6°, A点平均前移 3. 1mm;前牙覆盖增加 5. 2mm, 其中骨性变化占 63%,牙性变化占 37%。结论:牵引弓联合前方牵引是简便、有效的安氏Ⅲ类错牙合治疗装置,可最大程度地减轻畸形程度。更多还原

【Abstract】 Objective:To evaluate effects of traction arch combined with protraction on dental and skeletal changes in patients with Angel Ⅲ malocclusion in mixed dentition.Methods:Seventeen patients with Angle Ⅲ malocclusion were selected and treated with traction arch combined with protraction. Cephalometric radiographs were taken 6 months before the initiation of treatment, at the initiation of treatment and 6 months after treatment.Cephalometric analysis was used to examine the dental and skeletal changes.Results:Significant changes of maxillary anterior displacement and mandibular downward and backward rotation were observed in the seventeen patients:SNA increased 2.6°,A point moved forward 3.1 mm. The overjet correction of anterior teeth was 5.2 mm, 63% of the overjet correction was due to skeletal changes and 37% due to dental changes. Conclusion:Traction arch combined with protraction is a simple and effective apparatus in the treatment of Angle Ⅲ malocclusion.更多还原