目的：通过对正畸关闭陈旧性磨牙间隙前后牙槽嵴高度的对比，探讨关闭陈旧性磨牙间隙是否加重牙槽嵴吸收。

Objective: To study if closing obsolete molar space could cause severe resorption of alveolar crest through comparing the height of alveolar crest before and after closing obsolete molar space.

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内侧纵嵴明显突起者占62％，此时其髌骨内侧部关节面与股骨关节面之间的间隙较大；

When the medial longitudinal crest raised obviously in cases (62%), the space between the medial articular facel of patella and femoral articular facel was bigger;

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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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