改良 Twin-Block矫治器对骨性安氏Ⅱ类 1分类错 畸形患儿侧貌及 PAR指数的影响

目的 观察改良 Twin-Block矫治器对骨性安氏Ⅱ类 1分类错 畸形患儿侧貌及正畸标准指数（PAR）的影响。方法 回顾性分析 2016年 12月—2019年 5月于我院口腔科进行诊治的 42例骨性安氏Ⅱ类 1分类错 畸形患儿的病例资料,并依据治疗措施的不同分为观察组和对照组,各 21例。观察组患儿Ⅰ期均采用改良 Twin-Block矫治器进行矫正治疗 6个月,对照组患儿给予传统 Twin-Block矫治器进行矫正治疗 6个月,2组Ⅱ期均给予标准方丝弓矫治器矫正。比较治疗前和Ⅰ期治疗后 2组患儿颏部软组织侧貌形态和 PAR指数变化。结果 治疗 6个月后,与对照组相比,观察组患儿下唇基角、颊唇沟角增大,下唇凸点-H线距离缩小（P＜0.05）;同时观察组患儿前牙排列、后牙排列、颊侧咬合、覆盖、覆 、中线以及 PAR总分等指标均明显减小（P＜0.01）。结论 对骨性安氏Ⅱ类 1分类错 畸形患儿采用改良 Twin-Block矫治器有助于改善其软组织侧貌形态和 PAR指数,效果确切,值得临床推广应用。

Effects of modified Twin-Block appliance on profile and PAR index of children with skeletal class II division 1 malocclusion

Objective To observe the effect of modified Twin-Block appliance on the profile and PAR index of children with class Ⅱ division 1 malocclusion. Methods Data of 42 children with skeletal class Ⅱ division 1 malocclusionin the Department of Stomatology of our hospital from December 2016 to May 2019 were retrospectively analyzed. The patients were divided into observation group and control group, with 21 cases in each group. The patients in the observation group were treated with modified Twin-Block appliances during the stage Ⅰ, and the control group was treated with the traditional Twin-Block appliances for six months. During the stage Ⅱ, both groups were treated with the standard edgewise archwire appliances. The X-ray cephalometric measurements were used to analyze the profile of the children. The changes of PAR index before and after treatment were compared between the two groups. Results After 6-month treatment, compared with the control group, the base angle of the lower lip and the angle of buccal and labial groove increased in the observation group, and the distance between the convex point of the lower lip and the H-line decreased (P＜0.05); at the same time, the anterior teeth arrangement, posterior teeth arrangement, buccal occlusion, coverage, overbite (occlusion), midline and partotal score significantly decreased in the observation group compared with those of control group (P＜0.01). Conclusion The modified Twin-Block appliance is helpful to improve the profiles and postoperative PAR indices of children with class Ⅱ division 1 malocclusion, and it is worthy of clinical application.