患者,男,67岁。全口义齿修复后两周,其他情况良好,但咀嚼无力,检查:义齿固位好,关系正常,息止颌间隙5mm。其主要原因为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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