前方牵引结合多曲方丝弓矫治替牙早期骨性安氏Ⅲ类错[牙合]

Maxillary protraction and multiple loop edgewise arch wire technology in treatment of early mixed dentition skeletal class Ⅲ malocclusion

目的评价正畸治疗替牙早期骨性安氏Ⅲ类错[牙合]的疗效，探寻临床对骨性安氏Ⅲ类错[牙合]的有效治疗方法。方法选取20例8．5～9．1岁替牙早期骨性安氏Ⅲ类错[牙合]患者，将治疗进行双期矫治。第1期：给予上颌前方牵引配合快速扩弓；第Ⅱ期：应用多曲方丝弓技术矫治，直至[牙合]关系达到理想状态，给予保持，将治疗前、后的头颅侧位片测量结果进行对比分析。结果20例正畸治疗后．Ⅲ类骨面型得到改善；上颌及上前牙前移；下颌骨发生逆时针旋转；软组织侧貌改善．且[牙合]关系调整理想。结论对于处于替牙早期的骨性安氏Ⅲ类错[牙合]患者，应用前方牵引结合多曲方丝弓技术进行双期矫治，矫治后患者的Ⅲ类骨骼关系、高角骨面型及软组织侧貌均可获得满意效果。

Objective To evaluate the orthodontic effect of surgery on mixed dentition period class Ⅲmalocclusion and to investigate the effective therapeutic method of the skeletal class Ⅲ malocclusion. Methods A total of 20 patients aged 8. 5 to 9. 1 years with early mixed dentition class Ⅲ skeletal malocclusion. The treatment was divided into two phases. During the first phase, the entire stuffy group was treated with a bonded maxillary expansion and protraction. During the second phase, the entire study group received multiple loop edgewise arch wire （MEAW） treatment until an ideal occlusion relationship achieved. Comparison of the pre-and post-orthodontic treatment cephalometric radiographs had been done after maxillary protraction and MEAW were applied for patients. Results In the 20 patients after orthodontic treatment, Class Ⅲ skeletal facial profile was improved, the retraction of anterior teeth was obvious, and there were significant changes in dentition; the profile of soft tissue and satisfactory occlusion relationship were significantly improved, as compared with the changes between pre treatment and post-treatment. Conclusions Skeletal Ⅲ malocclusion in early mixed dentition can be successfully treated. The results can be satisfied with improved class Ⅲ skeletal and molar relationship, high-angle and profile of soft tissue.