单选题:根据下列条件,回答题:男,20岁,义齿修复后1年,主诉义齿压痛。查: 缺失,余留牙正常,义齿覆盖粘膜红肿、压痕,局部义齿

题目内容:
根据下列条件,回答题:男,20岁,义齿修复后1年,主诉义齿压痛。查: 缺失,余留牙正常,义齿覆盖粘膜红肿、压痕,局部义齿 基牙上弯制颌支托变形或折断。出现粘膜压痛的原因是(  )。 A.基托翘动
B.义齿下沉
C.咬合高
D.基托过小
E.基托不密合
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