单选题:下列各类固定桥中,对基牙的牙周组织损伤最大的是(  )。

题目内容:
下列各类固定桥中,对基牙的牙周组织损伤最大的是(  )。 A.半固定桥
B.单端固定桥
C.双端固定桥
D.粘结固定桥
E.弹簧式固定桥
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