问题：
[单选题]患者，男，67岁。全口义齿修复后1周，固位情况良好，咀嚼时上颌义齿容易脱落，最可能的原因为（ ）。
A、唇系带附丽过高
B、硬区无缓冲
C、基托边缘过长
D、后堤区封闭不良
E、咬合不平衡
参考答案：
E
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