n. impaction
All third molars has erupted before 30 except congenital missing, impaction and retarded eruption.
30岁前除先天缺失、阻生及萌出特别迟缓的第三磨牙外能够萌出的第三磨牙均已全部萌出。
·2,447,543篇论文数据，部分数据来源于NoteExpress
排列不齐和阻生的智齿通常要拔掉。
Wisdom teeth that are not well aligned and become impacted are often removed.
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只有1% - 2%的阻生会导致恶性肿瘤。
Only 1-2% of impactions result in malignant tumors.
目的总结上颌前牙埋伏阻生的X线影像特点。
Objective To summarize the X ray characteristics of embedded anterior maxillary teeth.
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