题目内容

女，82岁，牙列缺失，牙槽嵴狭窄，全口义齿修复后咀嚼效率低，其原因不可能是

A. 年龄过大
B. 牙槽嵴狭窄，固位较差
C. 垂直距离过低
D. 咬合接触点少
E. 人工牙型号选择过小

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