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女73岁,牙列缺失,戴用全口义齿2周后,自觉上唇处疼痛,左侧咬食物时义齿不脱位,右侧咬食物时义齿脱落,有时会咬伤颊部软组织,查见上唇系带处有一个直径约2mm的溃疡患者咬颊的原因除外()。
A . A.后牙排列偏颊侧
B . 面有尖锐边缘
C . 颊部软组织过于肥厚
D . 后牙覆盖过大
E . 后牙覆盖过小
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