问题
选择题
Lucy is very excited today because it is her _____ birthday.[ ]
A. fourteenth
B. the fourteenth
C. fourteen
D. the fourteenth
答案
答案：A
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Lucy is very excited today because it is her _____ birthday.[ ]
A. fourteenth
B. the fourteenth
C. fourteen
D. the fourteenth
答案：A
因根尖周炎行根管治疗，2周后铸造冠修复，4个月后出现咬合痛。检查时发现叩痛（＋），牙无松动，X线牙片显示根充物距根尖3mm，根尖区有阴影3mm×3mm，患牙与邻牙接触紧密。最可能导致疼痛的原因是（）
创伤