患者,女,16岁。要求修复上颌前牙缝隙,检查上颌侧切牙为过小牙,两中切牙之间有大于lmm的间隙,最好的治疗方法是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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