【单选题】【消耗次数：1】
患儿，5岁半，右下后牙肿痛2日，检查：右下第二乳磨牙冠大部分破坏，龋洞较深，叩(+)，松动Ⅱ度，颊侧牙龈处有0.5mm×0.5mm脓肿，X线片显示根吸收达根长1／3，根分歧有低密度阴影，右下第一恒磨牙根形成2/3，上方骨板消失。本病例右下第二乳磨牙的诊断是
①
慢性根尖炎急性发作
②
根尖脓肿
③
根吸收
④
深龋
⑤
慢性牙髓炎急性发作
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患儿，5岁半，右下后牙肿痛2日，检查：右下第二乳磨牙冠大部分破坏，龋洞较深，叩(+)，松动Ⅱ度，颊侧牙龈处有0.5mm×0.5mm脓肿，X线片显示根吸收达根长1／3，根分歧有低密度阴影，右下第一恒磨牙根形成2/3，上方骨板消失。如果治疗右下第二乳磨牙后仍然松动，症状不缓解，应做的处理是
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开放反复换药
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碘仿糊剂根管治疗
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银汞合金充填
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