本文涉及各种铸造方法的若干物理原理,并指出如何避免不适当的铸造。从冶金学的观点来看,目前的牙科黄金,特别是各种“陶磁”类是十分精细的合金系统。它与本世纪初所采用的铜与锌含量高比较软的金合金大不相同。现代的合金常含七种以上成份,如铂,钯,金,银,铜,钽,铟,铱等极硬,有高度抗化学力,而且结构较细。 This article addresses several physical principles of various casting methods and points out how to avoid unsuitable casting. From the metallurgical point of view, the current dental gold, especially the various “ceramic” is a very fine alloy system. It is very different from the gold and soft alloys of copper and zinc used in the beginning of this century. Modern alloys often contain more than seven ingredients, such as platinum, palladium, gold, silver, copper, tantalum, indium, iridium and other extremely hard, highly chemical resistance, and the structure of fine.