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。
Dental arch expansion appliance for 25 patients with mandibular arch stenosis showed that semi-fixed mandibular lingual arch expansion 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。
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…
分析研究显示，合理选择伸缩缝和固定墩的设置位置，可以显著改善全桥结构的抗震性能。
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