牵引弓联合前牵引治疗安氏Ⅲ类错畸形的临床分析

Clinical analysis of protraction in combination with traction arch for Angle Ⅲ malocclusion

目的探讨替牙早期及恒牙早期两个不同矫治时机对治疗安氏Ⅲ类错的影响。方法选择26例安氏Ⅲ类错牙合患者,牵引弓联合前方牵引6个月,术前术后进行头影测量分析。结果26例患者的上颌骨移位均有显著性变化,SNA增大2.2°±0.3°,A点前移3.3mm±1.3mm,上中切牙切端唇向移动3.8mm±1.2mm,其中替牙早期组表现更多的骨骼、更少的牙齿改变。结论牵引弓联合前方牵引是简便、有效的安氏Ⅲ类错治疗装置,在替牙早期比恒牙早期取得更为显著的治疗效果。

Objective To evaluate the effects of different treatment timings at early mixed dentition and early permanent dentition on Angle Ⅲ malocclusion. Methods Twenty six patients with Angle Ⅲ malocclusion were selected and applied protraction in combination with traction arch for six months. Cephalometric radiographs were taken before and after the treatment. Results Significant changes of maxillae moving forward were observed in all 26 cases： SNA was increased 2.2°± 0.3°, point A was moved forward 3.3mm±1.3mm, and maxillary center incisor was moved labially 3.8mm±1.2mm. Significant differences, more skeletal changes and less dental changes, were observed in early mixed dentition. Conclusion Protraction combined with the traction arch was a simple and effective treatment approach that plays an important role in the treatment of Angle m malocclusion. The treatment time of early mixed dentition was more effective than that of early permanent dentition.