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【单选题】
一个真性牙袋的定义为下列何者A.
牙龈沟向牙冠方向移动,而上皮附着无移动
B.
超过2mm 以上(指袋深度)
C.
超过7mm 以上(指袋深度)
D.
为上皮附着向牙根尖方向移动,且牙槽骨有破坏
E.
真性牙袋的牙槽骨破坏,无上皮附着根向移位
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A.
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C.
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A.
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A.
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B.
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