Objective To investigate the epidemiologic characteristic, the optimal treatment and protective measure of anterior teeth injury.

目的探讨前牙外伤的流行病学特点、最佳治疗方案以及预防措施。

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The abnormal reasons and its hazard of metal-polluted transformer oil caused by oil pump fault are analysed. The protective measure and an effective on-site treatment method are presented.

分析了由于油泵事故导致金属污染的变压器油油质异常的原因及其危害，提出了防止扩大污染影响的措施，并总结出了一套有效的变压器油现场再生处理的方法。

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