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患者因深龋一次银汞充填后短期内出现冷热刺激痛，无自发痛。查体：充填物完好，叩（一），冷热测正常牙面时无痛，但测充填体处痛处理应为（）。
A . A.观察
B . 脱敏
C . 去旧充填体，重新垫底充填
D . 牙髓治疗
E . 去旧充填体，改其他修复材料充填
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