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.
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。
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Results: bone resorption was more obvious in alveolar bone with residual roots than that without roots.