AIM: to compare the drug closing effect of calcium hydroxide or FC in pulpectomy and root canal therapy in rat.

目的：比较氢氧化钙和甲醛甲酚(FC)对去髓术和根管治疗术的封药效果。

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Objective: To study if closing molar Spaces could cause severe root resorption through comparing the effects of molar and premolar extractions on root resorption.

前言：目的：通过对磨牙拔除病例与前磨牙拔除病例的牙根吸收情况的对比，探讨关闭磨牙间隙是否加重牙根吸收。

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