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目的:评价采用上颌快速扩弓技术与下颌后牙后倾技术相结合的非减数治疗模式治疗青少年安氏Ⅲ类错边缘病例患者后所引发的牙骨性及软组织侧貌的改变。方法:收集9例符合安氏Ⅲ类错边缘病例特征的青少年患者,平均年龄13.4岁,上颌平均拥挤度为(6.7±2.8)mm,下颌平均拥挤度为(2.6±0.4)mm。采用Hyrax上颌快速扩弓装置及固定矫正装置予以治疗。治疗前、后进行X线头影测量分析,使用SPSS11.0软件包对数据进行配对t检验。结果:治疗前后比较,SNA增大1°,A点前移1.69mm,SNB减小0.69°,B点后退1.88mm,两者相结合,导致ANB增大1.69°(P<0.05);下颌平面下旋1.50°,Y轴角增大0.88°,表明下颌出现下旋(P<0.05);上切牙唇倾度增加4.75°(P<0.05),下切牙唇倾度无明显变化;鼻唇角无明显变化,上唇位置前移1.00mm(P<0.05),下唇位置后退0.63mm,使得上、下唇突度的差异度减小(P<0.05)。结论:该治疗模式有利于患者矢状向骨性关系及上、下唇关系的改善。
OBJECTIVE: To evaluate the changes in the cementum and soft tissue profile caused by the non-reduction treatment combined with maxillary rapid decompression and mandibular posterior incision in the treatment of adolescent Angle Ⅲ malocclusion. Methods: Totally 9 adolescents were enrolled in this study. The average age was 13.4 years. The average maxillary crowding degree was 6.7 ± 2.8 mm and the average crowding degree was 2.6 ± 0.4 mm. Hyrax maxillary rapid expansion device and fixed correction device to be treated. Before and after treatment, X-ray cephalometric analysis was performed, and the data was paired t-test using SPSS11.0 software package. Results: Before and after treatment, SNA increased by 1 °, A point shifted 1.69 mm, SNB decreased by 0.69 ° and point B decreased by 1.88 mm. The combination of the two resulted in an increase of 1.69 ° ANB (P <0.05) (P <0.05). The inclination of the upper incisors increased by 4.75 ° (P <0.05), and the inclination of the lower incisors did not change significantly. The nasolabial There was no significant change in the angle of the upper lip (P <0.05), while the position of the lower lip retreated by 0.63 mm (P <0.05). Conclusion: This treatment model is beneficial to the improvement of sagittal and skeletal relationship and the relationship between upper and lower lip in patients.