结论建立下牙弓后段可用间隙预测方程。
Conclusion the equations predicting the available space of lower posterior arch were established.
目的研究下牙弓后段可用间隙生长变化特点。
Objective To study the growth changes of available space of lower posterior arch.
上牙弓发育较早，但下牙弓发育速度快于上牙弓。
The development of the upper dental arch was earlier, but the down dental arch faster.
结论：上、下牙弓宽度不调与牙周病有密切关系。
CONCLUSION: the dis-coordination of the dental arch width in maxilla and mandible has an affinity with periodontal disease.
经治疗和保持后，上下牙弓宽度和长度并非一定会复发。
Not all of dental arch width and length will relapse after retention.
下牙弓变化中，第二双尖牙间和磨牙间宽度增加有显著性差异。
In addition, the changes of width between second bicuspid and mandibular molars showed statistical significances.
②肌位牙位不调与否的两组间在上下牙弓后段宽度上存在差异；
Significant difference of the posterior arch-widths was observed between the group with and without ICP-MCP discrepancy.
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。
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。
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.
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