患者,女,43岁,D6缺失,D57正常,医师设计D567 PFM烤瓷桥修复。下列哪项是该固定义齿的缺失牙功能恢复的标准?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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