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用hyrax、可摘平面式、quad-helix 3种不同的装置来对混合牙列期后牙锁(牙合)提供快速、半快速、慢速扩弓,以评价和比较骨和牙齿在矢状面、垂直面、水平面上的变化以及复发倾向。 材料和方法 被治疗的30个儿童,单侧后牙锁(牙合)16人,双侧后牙锁(牙合)14人。他们被分成3组,每组10人。第一组用可摘平面式装置进行半快速扩弓,第二组用quad-helix进行慢速扩弓,第三组用hyrax进行快速扩弓。他们开始的年龄分别是6.6岁,8.6岁,8.9岁。 半快速扩弓(SRME):要求患者除进食外,24h
Three different devices, hyrax, patch plane, and quad-helix, were used to provide rapid, semi-rapid, and slow expansion of the combined occlusion periodontal teeth to evaluate and compare the effect of bone and teeth in the sagittal Face, vertical, horizontal changes and recurrence tendency. Materials and Methods Thirty children, 16 with unilateral posterior occlusion and 14 with bilateral posterior occlusion. They are divided into 3 groups of 10 people each. The first group of semi-rapid expansion with removable planar device, the second group of slow expansion with quad-helix, the third group with hyrax rapid expansion. Their starting age is 6.6 years old, 8.6 years old, 8.9 years old. Semi-Rapid Expansion (SRME): Requires patients to eat outside, 24h