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目的 :通过X线头影测量软组织侧貌线距,评价并比较前导矫形联合固定矫治器与单纯拔牙对治疗生长发育期安氏Ⅱ类骨性错的疗效。方法:选取31例生长发育期安氏Ⅱ类错伴下颌后缩的病例。其中18例采用Ⅰ期固定式Twin-Block矫治器联合Ⅱ期固定矫治;13例采用传统单纯拔牙后直丝弓矫治进行治疗。在治疗前、Twin-block矫治完成后以及全部固定矫治结束后拍摄X线头颅侧位片,进行软组织侧貌线距测量分析。使用SPSS15.0软件包分别比较前导矫形组、单纯拔牙组治疗前、后的组内差异以及2组的组间差异。结果:前导矫形组下颌凸距、下唇厚度、颏唇沟厚度、上唇凸距在治疗前后差值改变均有显著性,单纯拔牙组在下唇厚度、下唇凸距、上唇凸距的治疗前后差值改变均有显著性。2组进行比较,下唇凸距治疗前、后差值的改变有显著性,而下颌凸距、上颌凸距、下唇厚度、上唇凸距、颏唇沟厚度在治疗前后差值的改变无显著性。结论:前导矫形联合固定矫治与单纯拔牙固定矫治相比,在治疗生长发育期骨性Ⅱ类下颌后缩患者中的疗效相近,而前导矫形组对下唇凸度的改变大于拔牙组。
OBJECTIVE: To evaluate the efficacy of the orthodontic appliance combined with orthodontic appliance and simple tooth extraction on the treatment of Class Ⅱ skeletal malformations during growth and development by measuring the soft tissue contour distance by X-ray cephaloemulsification. Methods: 31 cases of growth and development of Class Ⅱ malocclusion mandibular retrusion cases. Among them, 18 cases were treated with stage I fixed Twin-Block appliance combined with stage II fixation; 13 cases were treated with straight wire appliance after traditional simple extraction. Before treatment, Twin-block correction after the completion of treatment and all the fixed X-ray film after the end of lateral radiographs, soft tissue contour line measurement and analysis. The SPSS15.0 software package was used to compare the difference between the two groups before and after the treatment in the leading orthopedic group and the simple extraction group. Results: The difference of the maxillary protuberance, the thickness of the lower lip, the thickness of the chin lip and the lip of the upper lip before and after treatment were significantly different in the orthodontic group. The thickness of the lower lip, the distance between the lower lip and the upper lip before and after treatment Difference changes were significant. The differences between the two groups before and after treatment of lower lip and convex were significant. The changes of the difference of the maxillary protuberance, the maxillary protuberance, the thickness of the lower lip, the distance between the upper lip and the chin and lip groove before and after treatment did not change Significance. CONCLUSION: Compared with simple orthodontic treatment, orthodontic and orthodontic treatment has similar curative effect in the treatment of skeletal class Ⅱ mandibular retrusion in the growth and development stage, while the leading orthodontic group has more changes in the lower lip crown than the tooth extraction group.