题目内容
对无牙颌后堤区的描述，正确的是
2021-11-10
A.应在上下唇系带处制作后堤区
B.上颌硬区应制作后堤区
C.上颌后堤区位于口腔前庭沟内
D.上颌后堤区是上颌全口义齿后缘封闭区
E.额棚区也称为后堤区
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