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牙齦上長膿包是怎麼回事?是慢性根尖周炎的患牙根部周圍組織,受根管內病原物質長期刺激出現的慢性炎症反應。表現為炎症肉芽組織的形成或牙槽骨的破壞。根尖部的膿液有時可逐漸穿通骨壁和軟組織,在牙齦上形成瘺管,俗稱“膿包”。