目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。
Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.
哥斯达黎加驻华大使馆祝贺2013年亚冠联赛冠军：中国广州恒大！
The Embassy of Costa Rica to China congratulates the champions of 2013 Asian Champions Cup: China's Guangzhou Hengda!
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