结论：采用柔索约束、间隙元作为下颌骨及髁突的边界条件，可提高模型的相似性，为下颌骨的受力分析奠定基础。
Conclusion: Cable and gap elements are reasonable boundary conditions of the finite element model of mandible, which will improve the similarity of the model.
下颌骨后退距离与后气道间隙面积的减小值和舌骨垂直方向变化呈正相关。
There was a strong correlation between the amount of mandibular setback and the vertical change of hyoid and pharyngeal airway area.
不同作用时间的矫形力下颞下颌关节间隙改变无明显差异。
There was no obvious difference on the change of the TMJ space in different period of functional treatment.
结论：拔除下颌第二前磨牙后，第三磨牙萌出间隙明显增大，有助于下颌第三磨牙的正常萌出。
Conclusion: Mandibular second premolar after pulling, the third molar eruption clearance increased obviously, conduce to the jaw third molar normal eruption.
形态：彗星状肿块，尾部位于塌陷的舌下间隙，头部位于下颌下间隙的后方。
Morphology: Comet-shaped mass with "tail" in collapsed SLS and "head" in posterior SMS.
目的探讨下颌阻生智齿拔除术中意外进入周围组织间隙的原因及处理与预防措施。
Purpose to find out the reasons of hinder and catch wisdom tooth that unexpectedly entered surrounding tissue during pull out surgery and to probe the treatment and prevent precautionary ways.
摘要目的：探讨不同类型下颌骨骨折对上气道间隙的影响。
Abstract: Objective: To assess the changes of upper airway clearance after different type of mandibular fractures.
目的：下颌骨后退术与咽气道间隙的变化的关系。
Purpose: This retrospective study evaluated the change in pharyngeal airway space associated with surgical mandibular setback.
咽气道间隙面积与下颌骨后退量明显相关。
There was a strong correlation between the amount of mandibular setback and the decrease in pharyngeal airway space area.
方法：观察下颌第一磨牙陈旧性拔牙间隙29处。测量矫治前后该处牙槽嵴高度，将测量值进行配对t检验。
Method: 29 lower first molar Spaces were observed and the height of alveolar crest before and after treatment were analyzed with paired-t tests.
方法：观察下颌第一磨牙陈旧性拔牙间隙29处。测量矫治前后该处牙槽嵴高度，将测量值进行配对t检验。
Method: 29 lower first molar Spaces were observed and the height of alveolar crest before and after treatment were analyzed with paired-t tests.
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