影响暴露于过氧化脲漂白剂的牙科汞合金中汞释放的因素。
Factors affecting mercury release from dental amalgam exposed to carbamide peroxide bleaching agent.
作者信息
Rotstein Ilan, Avron Yael, Shemesh Hagai, Dogan Hatice, Mor Chaim, Steinberg Doron
机构信息
Division of Surgical Therapeutic and Bioengineering Sciences, University of Southern California School of Dentistry, 925 West 34th Street, DEN 310, Los Angeles, CA 90089-0641, USA.
出版信息
Am J Dent. 2004 Oct;17(5):347-50.
PURPOSE
To assess, in vitro, the effects of aging and surface polishing on mercury release from dental amalgams exposed to 10% carbamide peroxide at two pH levels.
METHODS
Samples of fresh and aged amalgam, polished and unpolished, were treated with 10% carbamide peroxide at pH 4.5 and at pH 6.5 for periods of 1, 4, 7, 10 and 13 days. At each time period, mercury concentrations in solution were measured using a cold-vapor atomic absorption mercury analyzer system and compared to control samples treated with phosphate buffer.
RESULTS
Amalgam samples exposed to 10% carbamide peroxide released significantly more mercury in solution than samples exposed to phosphate buffer controls. Mercury release was time-dependent and significantly higher in aged amalgam than in fresh amalgam (P < 0.001). Mercury release was also pH-dependent and higher in unpolished amalgam.
目的
在体外评估老化和表面抛光对两种pH值水平下暴露于10%过氧化脲的牙科汞合金汞释放的影响。
方法
将新鲜和老化的汞合金样本，分为抛光和未抛光的，在pH 4.5和pH 6.5条件下用10%过氧化脲处理1、4、7、10和13天。在每个时间段，使用冷蒸气原子吸收汞分析仪系统测量溶液中的汞浓度，并与用磷酸盐缓冲液处理的对照样本进行比较。
结果
暴露于10%过氧化脲的汞合金样本在溶液中释放的汞明显多于暴露于磷酸盐缓冲液对照的样本。汞释放呈时间依赖性，老化汞合金中的汞释放明显高于新鲜汞合金（P < 0.001）。汞释放也与pH有关，未抛光汞合金中的汞释放更高。
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