慢性呼吸衰竭最常见的病因是()
A.重症肺结核
B.胸廓病变
C.阻塞性肺疾病
D.肺间质纤维化
E.尘肺
参考答案:C
患者男性,74岁,缺失,下颌缺牙区牙槽嵴吸收严重,拟行可摘局部义齿修复。
对于这种游离端缺牙,近缺隙的末端基牙一般采用()。
A.三臂卡环
B.单臂卡环
C.对半卡环
D.下返卡环
E.RPI卡环
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