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Conclusion Pulpal exposure can find the natural development of pulpitis, and it is one of the methods to establish the model of rat experimental pulpitis. 結(jié)論單純開放法可觀察到牙髓炎的自然發(fā)展過程，是建立大鼠實(shí)驗性牙髓炎動物模型的方法之一。