患者,女,20岁,<img src='https://img2.soutiyun.com/shangxueba/ask/18228001-18231000/18228911/2015091014432381006.jpg' />外伤骨折后,在口内行即刻根充术后转修复科,口腔检查,<img src='https://img2.soutiyun.com/shangxueba/ask/18228001-18231000/18228911/2015091014432381006.jpg' />冠2/3折断,不松动,根管内有充填物,叩()。余牙及咬合关系正常。下列对冠桩的描述中,错误的是()。
![](/upload/20220827/c85071da6ff0aadc10ebce6c25bb4f0d.png)
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