那是空的根管(牙髓室)。

That's the hollow pulp canal (chamber).

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目的：总结9例脊髓室管膜瘤的手术体会。

Objective: To summarize the experience of operation for spinal cord ependymoma.

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观察玻璃离子水门汀和氢氧化钙联合修复髓室底穿孔的临床疗效。

Its effective to repair perforation of pulp floor with glass ionomer cement.

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观察玻璃离子水门汀和氢氧化钙联合修复髓室底穿孔的临床疗效。

Its effective to repair perforation of pulp floor with glass ionomer cement.

youdao