11例10—14岁骨性Ⅲ类错He患者的疗效观察

目的 观察联合应用前方牵引和上颌快速扩弓治疗10-14岁骨性安氏Ⅲ类错He患者的临床效果。方法 以11例10-14岁骨性Ⅲ类错He患者为观察组，32例替牙早期骨性Ⅲ类错He患者为对照组，两组均采用联合应用前方牵引和上颌快速扩弓装置治疗，平均治疗时间6个月，治疗前后均拍摄头影侧位片，并采用一种新的头颅参照系统，对结果进行分析比较，评价治疗效果。结果 两组患者均发生上颌骨前移，下颌骨向下后旋转，向前生长受限，观察组前牙覆盖增加5.3mm，骨性变化占51%，牙性变化占49%；其中，9例患者前牙达到正常覆He、覆盖关系，磨牙中性关系，2例患者前牙达到浅覆He，浅覆盖关系，后牙中性偏近中关系。结论 联合应用前方牵引和上颌快速扩弓治疗10-14岁轻中度骨性反He患者有较好疗效，可减轻畸形程度，避免手术治疗，最大程度地改善患者的软硬组织关系。

Clinical results of skeletal class III malocclusion in 11 children aged from 10 to 14 years]

OBJECTIVE: The aim of this study is to investigate the clinical effects of combined protraction facemask and rapid maxillary expansion in the treatment of Class III malocclusion in 11 children aged from 10 to 14 years. METHODS: The observation group included 11 subjects in late mixed dentition or early permanent dentition, and the control group included 32 subjects in early mixed dentition. Protraction facemask and rapid maxillary expansion device was used and the mean treatment time was 6 months. Cephalometric radiographs were taken at the initiation of treatment (T1) and after 6 months of treatment (T2). In this way,(T2-T1) represented cephalometric changes after the treatment and cephalometric analysis based on a new basecranical reference system was used to compare the changes. RESULTS: All the subjects had the following changes: the maxilla moved forward,the mandible exhibited a downward and backward rotation and the forward growth was restricted. The overjet correction of the observation group was 5.3mm, 51% of the overjet correction was due to skeletal changes and 49% due to dental changes.9 cases obtained normal overjet and overbite and molar relationship. CONCLUSION: The combination of protraction facemask and rapid maxillary expansion is helpful to the correction of Class III malocclusion in children aged from 10 to 14 years. It can alleviate the degree of deformation,avoid surgery, and improve the relationship between hard and soft tissue.