患者,男,20岁。一日前右上中切牙外伤。检查盛牙冠折露髓,叩痛(+),不松动,冷测一过性敏感X线片检查未见根折。治疗应为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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