Precious-metal dental casting alloys
Precious-metal dental casting alloys
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贵金属牙科铸造合金
DOI：
10.1179/imr.1982.27.1.260
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
R. German
中科院分区：
文献类型：
--
作者：
R. German
这些贵金属被用于牙科铸造合金，因为它们在人体内具有公认的稳定性。这种用途分为传统的金色牙冠和牙桥修复体，以及更新、更美观的瓷贴面设备。三个三元体系为大多数商业上成功的合金提供了基础：Au-Ag-Cu、Pd-Ag-Cu和Au-Pt-Pd。从合金配方和性能方面讨论了这三种体系的基本特点。偏析、相稳定性、硬化性、熔融行为、热膨胀、颜色、可浇注性、变色、腐蚀和生物相容性等因素都与这些三元体系有关。综述了具有代表性的化学物质的具体应用和详细性质。数据显示了成分和微观结构对机械、物理、热和化学性能的影响。讨论了几个尚未解决的问题，如瓷-合金兼容性的标准，以提供对活跃研究领域的看法。在公认的生物相容性的基础上，总体上强调了贵金属在牙科中的使用；包括了这些合金的应用和配方的当前趋势，以加强这一点。
The precious metals are used for dental casting alloys because of their recognized stability in the human mouth. This use is split between the traditional gold-coloured crown and bridge restorations and the newer, more aesthetic porcelain-veneered devices. Three ternary systems provide the basis for most of the commercially successful alloys; Au-Ag-Cu, Pd-Ag-Cu, and Au-Pt-Pd. Basic features of these three systems are discussed with respect to alloy formulation and performance. Factors such as segregation, phase stability, hardenability, melting behaviour, th.ermal expansion, colour, castability, tarnish, corrosion, and biocompatibility are related to these ternary systems. The review focuses on specific applications and details properties of representative chemistries. Data are presented to demonstrate composition and microstructure influences on mechanical, physi cal, thermal, and chemical properties. Several unresolved questions are discussed, such as the criteria for porcelain-alloy compatibility, to provide a view on areas of active research. An overall emphasis is given to the use of precious metals in dentistry based on their accepted biocompatibility; current trends in the application and formulation of these alloys are included to enhance this point.