皮皮学，免费搜题
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【单选题】
一老年患者因牙周病Ⅱ度松动拔除了左下颌的第一前磨牙、第二前磨牙及第一磨牙，术后6小时仍出现牙窝渗血，给予局部缝合、咬棉纱等处理未见好转。可能的出血原因是A.
患者全身状况不佳
B.
拔除牙齿过多、牙窝过大
C.
术者操作粗暴，钳夹牙龈致其损伤
D.
牙窝内残留炎性肉芽组织
E.
牙窝内残留牙根
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