Peraire Maria, Martinez-Gomis Jordi, Anglada Josep M, Bizar Josep, Salsench Juan, Gil Francesc J
Department of Prosthodontics, Faculty of Dentistry, Universitat de Barcelona, Spain.
Int J Prosthodont. 2007 May-Jun;20(3):286-8.
This study evaluated the effects of recasting on high noble, noble, and nickel-based alloys, as well as on titanium. Four specimens of each material were cast and recast 7 times. Chemical composition, microstructure, microhardness, and ion release were determined before and after the first cast and following each recast. Zinc and tin concentrations in the high noble alloy decreased significantly with recasting; consequently, the release of these ions decreased as well. A significant increase in Vickers hardness appeared in the fifth recast in both the high noble alloy and titanium. The noble alloy and the nickel-based alloy demonstrated great stability after 7 recasts. The results suggest not recasting titanium.
本研究评估了重熔对高贵金属合金、贵金属合金、镍基合金以及钛的影响。每种材料制作四个试样，进行铸造并重复重熔7次。在首次铸造前、每次重熔后，测定其化学成分、微观结构、显微硬度和离子释放情况。高贵金属合金中的锌和锡浓度随着重熔次数的增加而显著降低；因此，这些离子的释放量也随之减少。高贵金属合金和钛在第五次重熔时维氏硬度显著增加。贵金属合金和镍基合金在7次重熔后表现出很高的稳定性。结果表明不应对钛进行重熔。
