Willershausen-Zönnchen B, Gross E, Dermann K, Sonnabend E
Poliklinik für Zahnerhaltung und Parodontologie, München.
Dtsch Zahnarztl Z. 1991 Apr;46(4):290-2.
The direct contact between amalgam and cast metal may enhance electrochemical reactions. In a study to determine the amount of mercury released in these reactions, six cast metal alloys with increasing precious metal contents were placed in immediate contact (contact area 10 mm2) to two non-gamma 2-amalgams (Amalcap, Valiant) and incubated with artificial saliva at 37 degrees C for up to 8 weeks; then the salivary mercury concentrations were measured. After the end of the incubation period the case metal surfaces were analyzed by ESCA for metal appositions. The results showed that direct contact between amalgam and cast metal after storage in artificial saliva for 8 weeks resulted in a minor release of mercury (22.7 +/- 10.63 ng/ml Hg). On the cast metal plates themselves only smallest mercury concentrations could be demonstrated. These in vitro tests have shown again that, although charge transfers do occur when different metals are in direct contact, they do so only to a minor degree, because of the passivation processes involved.
汞合金与铸造金属之间的直接接触可能会增强电化学反应。在一项确定这些反应中汞释放量的研究中，将六种贵金属含量不断增加的铸造金属合金与两种非γ2汞合金（Amalcap、Valiant）直接接触（接触面积为10平方毫米），并在37摄氏度的人工唾液中孵育长达8周；然后测量唾液中的汞浓度。孵育期结束后，通过电子能谱分析（ESCA）对铸造金属表面的金属附着情况进行分析。结果表明，在人工唾液中储存8周后，汞合金与铸造金属之间的直接接触导致汞少量释放（22.7±10.63纳克/毫升汞）。在铸造金属板本身仅能检测到极低的汞浓度。这些体外试验再次表明，尽管不同金属直接接触时确实会发生电荷转移，但由于涉及钝化过程，电荷转移程度很小。
