It was testified by sem that the dentinal tubule was sealed by semiconductor laser irradiation.

扫描电镜显示，用半导体激光仪照射后，牙本质小管口被封闭。

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Conclusion By adopting the root canal therapy together with the technologies of inner bleaching and seal dentinal tubule we can prevent and cure crown surface discoloration effectively.

结论在根管治疗的同时结合内漂白技术和牙本质小管封闭技术能有效地防治牙冠表面变色。

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Conclusions Applying 30% supersaturated potassium oxalate to block dentinal tubule could prevent or reduce crown surface discoloration effectively after front teeth canal therapy.

结论使用30%草酸钾封闭牙本质小管可有效防止及减少前牙根管治疗后牙冠变色。

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