The expansion of the arch was mainly caused by the mcrease of arch width.
牙弓的扩大主要是牙弓宽度的增加。
2
Dental archexpansion appliance for 25 patients with mandibular arch stenosis showed that semi-fixed mandibular lingual archexpansion had good effect and could be used to expand mandibular arch.
对25例下牙弓狭窄患者的扩弓矫治表明,下颌舌侧半固定扩弓矫治器的扩弓效果良好。
3
The results are shown that the seismic performance of the arch bridge is improved by adjusting the expansion joint and the fixed pier to the right loca…