患者,女,27岁。上前牙冠修复两周,一直感牙龈胀痛不适。查:1烤瓷全冠,唇侧颈缘位于龈沟内1mm,龈缘充血。引起胀痛最可能的原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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