患儿，5岁半。右下后牙肿痛两日。检查右下第二乳牙磨牙冠大部分破坏，龋洞较深，叩（+)松动n度，颊侧牙龈处有0.5mmx0.5mm脓肿。X片示根吸收1/3,根分歧有低密度影。本病例右下第二乳磨牙诊断是

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