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目的:探讨支架式上颌前牵引矫治器对儿童骨性Ⅲ类错的矫治效果。方法:采用改良支架式前牵引矫治器对26例儿童骨性Ⅲ类错患者(7～10岁)进行前牵引治疗。分别在治疗开始(T0)和结束(T1)时拍摄头颅定位侧位片,进行定点测量分析。结果:①硬组织变化:ANB角增加5.26°(P<0.001),Wit's值增加5.26mm(P<0.01),Ptm-A增加2.28mm(P<0.05),Yaxis增加1.25°(P<0.001);SNB角减小0.67°(P>0.05),Go-Me、Co-Gn分别增加0.72mm和1.56mm(P>0.05),SN-PP减小1.24°,PP-MP增加4.2°(P<0.05),颌凸角增加7.07°(P<0.001),下面高、下面高/全面高分别增加2.47(P<0.05)、0.42(P>0.05)。U1-NA角增加4.57°(P<0.001),L1-NB角减小3.21(P<0.05),Ms6-PP距增加0.45mm(P>0.05)。2)软组织变化:面型角增大5.37°(P<0.01),颏唇角减小2.70°(P<0.05),上唇-E线距增大1.51mm(P<0.01),下唇-E线距减小1.25mm(P<0.05)。结论:支架式上颌前牵引矫治器矫治儿童骨性Ⅲ类错,可产生显著治疗效果:上颌骨前移,上下颌骨的矢状关系改善,凹陷型的畸形容貌显著改善,但高角患者慎用。
Objective: To investigate the effect of stent-type maxillary distraction appliance on skeletal Class Ⅲ malocclusion in children. Methods: Twenty-six children with skeletal class Ⅲ malocclusion (aged 7-10 years) underwent pre-traction treatment with a modified stent-type front traction appliance. At the beginning of treatment (T0) and the end (T1), the cephalometric slices were taken and sentinel measurements were made. Results: ①The changes of hard tissue were as follows: the ANB angle increased 5.26 ° (P <0.001), the Wit's value increased 5.26mm (P <0.01), the Ptm-A increased 2.28mm ; SNB angle decreased 0.67 ° (P> 0.05), Go-Me and Co-Gn increased 0.72mm and 1.56mm respectively (P> 0.05) 0.05). The angle of maxillary protuberance was increased by 7.07 ° (P <0.001). The height of the lower face and the lower face of the lower face increased by 2.47 (P <0.05) and 0.42 (P> 0.05), respectively. The angle of U1-NA increased 4.57 ° (P <0.001), the angle of L1-NB decreased 3.21 (P <0.05) and the distance of Ms6-PP increased 0.45mm (P> 0.05). (2) The changes of soft tissue: the facial angle increased by 5.37 ° (P <0.01), the chin angle decreased by 2.70 ° (P <0.05) The line spacing is reduced by 1.25 mm (P <0.05). Conclusion: The treatment of children with skeletal Class Ⅲ malocclusion by pediatric maxillary traction appliance can produce significant therapeutic effect: the maxillary advancement, the improvement of the sagittal relationship between the maxilla and the mandible, the deformity appearance of the deformity is significantly improved. However, use.