Ferracane J L, Hanawa T, Okabe T
Department of Dental Materials Science, Oregon Health Sciences University, Portland 97201.
J Dent Res. 1992 May;71(5):1151-5. doi: 10.1177/00220345920710050401.
The release of mercury from four freshly-triturated amalgams into air, argon, and moist air environments was quantitated at three different temperatures. Although a measurable amount of mercury was released from dental amalgam, the evaporation rate was immediately reduced by several phenomena, the most important being the formation of an oxide film on the surface. This hypothesis was supported by the fact that release rates were elevated in an inert argon environment, but declined dramatically once air was introduced and oxidation could occur. The further amalgamation of "free" mercury, as well as the presence of water vapor, also contributed to the reduced release rates observed during aging. Mercury release was reduced to a negligible level within three to four hours after trituration. Only one of the amalgams, Tytin, demonstrated a thermal dependence for mercury release in air. The results of this study suggest that the exposure to mercury vapor from a freshly placed amalgam restoration would be negligible in consideration of the normal estimated daily intake from all other sources.
在三种不同温度下，对四种新研磨的汞合金在空气、氩气和潮湿空气环境中汞的释放量进行了定量分析。尽管从牙科汞合金中释放出了可测量的汞量，但蒸发速率会立即因几种现象而降低，其中最重要的是在表面形成氧化膜。这一假设得到了以下事实的支持：在惰性氩气环境中释放速率会升高，但一旦引入空气且发生氧化，释放速率就会急剧下降。“游离”汞的进一步合并以及水蒸气的存在，也导致了老化过程中观察到的释放速率降低。研磨后三到四小时内，汞的释放量降至可忽略不计的水平。只有一种汞合金Tytin在空气中的汞释放表现出对温度的依赖性。这项研究的结果表明，考虑到来自所有其他来源的正常估计每日摄入量，新放置的汞合金修复体所释放的汞蒸气对人体的暴露量可以忽略不计。
