对于牙周炎致病性最强的是（　　）A.龈上菌斑B.颌创伤C.附着性龈下菌斑D.非附着性龈下菌斑E.牙石

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问题对于牙周炎致病性最强的是（　　） A.龈上菌斑 B.颌创伤 C.附着性龈下菌斑 D.非附着性龈下菌斑 E.牙石

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答案 D

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