目的 :为了解微量元素在牙周病的发生、发展中所起的作用。方法 :用原子吸收法测定患者头发中锌、铜、铁的含量。结果 :牙龈炎组锌、铜、铁的含量均在正常范围内 ,而牙周炎组锌、铁低于正常值 ,铜在正常值以内。讨论 :牙龈炎、牙周炎两组的锌、铁含量有显著差异 ( P<0 .0 5) ,提示 ,铁、锌含量低下 ,是牙周炎发生、发展的重要原因之一 Objective: To understand the role of trace elements in the occurrence and development of periodontal disease. Methods: The content of zinc, copper and iron in hair of patients were determined by atomic absorption spectrometry. Results: The levels of zinc, copper and iron in gingivitis group were all in the normal range, while the levels of zinc and iron in periodontitis group were lower than normal and the copper was within the normal range. Discussion: Gingivitis, periodontitis two groups of zinc, iron content was significantly different (P <0. 05), suggesting that iron, zinc content is low, is one of the important causes of periodontitis