An in vitro comparison of nickel and chromium release from brackets.
An in vitro comparison of nickel and chromium release from brackets.
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DOI：
10.1590/s1806-83242009000400009
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发表时间：
2009-10
影响因子：
2.5
通讯作者：
Ana Cristina Soares Santos Haddad;A. Tortamano;Alexandre L. Souza;P. Oliveira
中科院分区：
文献类型：
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作者：
Ana Cristina Soares Santos Haddad;A. Tortamano;Alexandre L. Souza;P. Oliveira
本研究旨在比较模拟口腔环境中来自不同制造商的托槽中镍（Ni）和铬（Cr）的释放量。将280个托槽按制造商等分为7组。6组托槽为不锈钢托槽，1组托槽为低镍钴铬合金托槽（0.5%）。采用国际标准ISO 10271/2001提供测试方法。将每个托槽在37摄氏度下浸入0.5ml合成唾液（SS）或人造牙斑液（PF）中28天。每7天更换一次溶液，并通过光谱法进行分析。应用Kruskal-Wallis检验。不锈钢中镍的释放量（每周微克L（-1））在各组之间变化，从“低于检测限”到694，在PF中从49到5，948.5。由钴铬合金制成的托槽组，镍含量最少，并没有释放最少的镍。在SS和PF中检测到的Cr量（微克L（-1）/周）分别为1至10.4和50.5至8，225。因此得出结论，来自不同制造商的托槽呈现不同的腐蚀行为。需要进一步的研究来确定这些发现的临床意义。
This study aimed at comparing amounts of nickel (Ni) and chromium (Cr) released from brackets from different manufacturers in simulated oral environments. 280 brackets were equally divided into 7 groups according to manufacturer. 6 groups of brackets were stainless steel, and 1 group of brackets was made of a cobalt-chromium alloy with low Ni content (0.5%). International standard ISO 10271/2001 was applied to provide test methods. Each bracket was immersed in 0.5 ml of synthetic saliva (SS) or artificial plaque fluid (PF) over a period of 28 days at 37 degrees Celsius. Solutions were replaced every 7 days, and were analyzed by spectrometry. The Kruskal-Wallis test was applied. Amounts of Ni release in SS (microg L(-1) per week) varied between groups from 'bellow detection limits' to 694, and from 49 to 5,948.5 in PF. The group of brackets made of cobalt-chromium alloy, with the least nickel content, did not release the least amounts of Ni. Amounts of Cr detected in SS and in PF (microg L(-1) per week) were from 1 to 10.4 and from 50.5 to 8,225, respectively. It was therefore concluded that brackets from different manufacturers present different corrosion behavior. Further studies are necessary to determine clinical implications of the findings.