前方牵引联合快速扩弓矫治骨性Ⅲ类错的面部软组织变化

Soft tissue changes in skeletal Class Ⅲ patients treated with maxillary protraction

目的:研究上颌前方牵引联合快速扩弓矫治恒牙早期骨性Ⅲ类错的软组织变化。方法:选取14例恒牙早期骨性Ⅲ类错患者为治疗组,应用联合法治疗6个月,在治疗前(T1)、治疗后(T2)拍摄头颅侧位X线片;选取12例未治疗骨性反患者为对照组,也在相应时间拍摄X线片,对两组进行头影测量分析。结果:治疗组发生显著的软组织改变,H角和软组织面凸角显著增大,软组织面角显著减小,软组织侧貌得以改善。结论:前方牵引联合快速扩弓能够对恒牙早期骨性Ⅲ类错患者的软组织侧貌产生显著的矫形效果。

Objective To evaluate the hard tissue changes in skeletal Class Ⅲ patients following the application of combined rapid maxillary expansion（RME）and maxillary protraction in early permanent dentition.Methods The 14 patients treated consecutively with RME for one week and maxillary protraction for six months were compared with 12 untreated,age and sex and skeletal type matched controls with skeletal Class Ⅲ malocclusion.Lateral cephalometric radiographs were used to quantify the hard tissue changes before treatment（T1） and after treatment（T2）.Results The subjects in the treatment group had significant soft tissue changes.H angle and soft tissue facial convexity increased and soft tissue facial angle decreased significantly.The Class Ⅲ concave profile became more balanced and straight.Conclusion The application of combined rapid maxillary expansion（RME） and maxillary protraction was an effective method to skeletal Class Ⅲ patients in early permanent dentition.