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口腔修复科所用的铸造合金(Asting Alloys)已有最初的元合金、二元合金增加至多达7、8种以上的元素如钴、镍、钼、钽、钛、锡等。这些元素的增加改善和提高了合金的机械性能和化学稳定性,铸造用合金根据其熔化温度分为三类:高熔合金(熔点在1100℃以上),中熔合金(熔点在500°～1000℃),低熔合金(熔点在300°～500℃)。按使用范围可分(1)铸造部分托牙支架、基板等用合金如钴铬合金,18—8不锈钢,镍钴钢合金和金铂合金等。(2)冠桥,嵌体用合金如镍铬合金,银钯合金、金合金等。(3)烤瓷用合金如金合金、镍铬合金及镍钴合金等。按经济价值又可分为贵金属合金如金合金、金铂合金等:半贵合金如银钯合金和非贵合金、如钴铬合金,镍铬合金,18—8不锈钢等。
Asting Alloys used in the Department of Stomatology has been the first elemental alloy, the binary alloy increased up to more than 7,8 kinds of elements such as cobalt, nickel, molybdenum, tantalum, titanium, tin and so on. The addition of these elements improves and enhances the mechanical and chemical stability of the alloys. The alloys for casting are divided into three categories according to their melting temperature: high melting alloy (melting point above 1100 ° C), mid melting alloy (melting point 500 ° to 1000 ° C ℃), low melting alloy (melting point of 300 ° ~ 500 ℃). According to the scope of use can be divided (1) cast part of the dental bracket, substrate and other alloys such as cobalt chromium, 18-8 stainless steel, nickel and cobalt steel alloy and gold and platinum alloy. (2) crown bridge, inlay alloy such as nickel-chromium alloy, silver-palladium alloy, gold alloy. (3) porcelain alloys such as gold alloy, nickel-chromium alloy and nickel-cobalt alloy. According to economic value can be divided into precious metal alloys such as gold alloy, gold and platinum alloy: Semi-precious alloys such as silver palladium alloy and non-precious alloys, such as cobalt chromium alloy, nickel-chromium alloy, 18-8 stainless steel.