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首页> 外文学位 >Metallurgical structures, in vitro corrosion resistance and biocompatibility of high-palladium dental casting alloys.
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Metallurgical structures, in vitro corrosion resistance and biocompatibility of high-palladium dental casting alloys.

机译：高钯牙科铸造合金的冶金结构，体外耐蚀性和生物相容性。

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摘要

A transmission electron microscopic (TEM) investigation was performed on four representative commercial high-palladium dental alloys in both as-cast and simulated porcelain-firing heat-treated conditions. The results indicated that a tweed ultrastructure (space between striations ;In vitro corrosion resistance of five representative commercial high-palladium dental alloys in the as-cast and simulated porcelain-firing heat-treated conditions was evaluated by potentiostatic/potentiodynamic polarization, using two deaerated stagnant electrolytes: 0.09% NaCl and the Fusayama solutions. The deaerated Fusayama solution was considered to be a more corrosive environment, compared to the 0.09% NaCl solution, based on the results of this study. The Pd-Cu-Ga and Pd-Ga alloys showed similar electrochemical properties. The somewhat active electrochemical behavior for the two heat-treated Pd-Cu-Ga alloys, Liberty and Spartan Plus was attributed to casting defects and microstructural phases on the test specimen surface. The results from this in vitro study indicated that the high-palladium alloys in both the as-cast and heat-treated conditions show either an active-passive transition or retain passivity under electrochemical conditions similar to the oral environment. Heat-treated Freedom Plus had an unstable oxide film form on the surface during anodic polarization and appeared to have a tendency for crevice corrosion in the Fusayama solution.;With the widespread use of high-palladium alloys for metal-ceramic and all-metal restorations in many countries, many adverse effects related to these alloys have been publicized lately. This study provided a systematic summary of published information about the biocompatibility of palladium and some palladium compounds. The current literature on the biocompatibility of high-palladium dental alloys is discussed with particular attention to certain metallurgical and microstructural factors which may have important roles in vivo. Based on the currently available information, high-palladium dental alloys appear to be biocompatible materials, except for the hypersensitivity problem associated with these alloys in certain populations. Until a reliable method to test the hysensitivity of a subject to high-palladium alloys is developed, it is still the responsibility of a dentist to choose the appropriate dental alloy for his or her patient.
机译：在铸态和模拟烧瓷热处理条件下，对四种代表性的商用高钯牙科合金进行了透射电子显微镜（TEM）研究。结果表明，采用恒电位/恒电位极化法，通过两次脱气，评估了铸态和模拟瓷烧热处理条件下的花呢超微结构（条纹之间的间距；五种代表性的商用高钯牙科合金的体外耐蚀性）。停滞的电解质：0.09％NaCl和Fusayama溶液根据该研究结果，与0.09％NaCl溶液相比，脱气的Fusayama溶液被认为是更具腐蚀性的环境。合金显示出相似的电化学性能，两种热处理过的Pd-Cu-Ga合金Liberty和Spartan Plus的电化学行为有些活跃，这归因于试样表面的铸造缺陷和微观结构相，这项体外研究的结果表明在铸造和热处理条件下的高钯合金都显示出主动-被动过渡或保持钝化在类似于口腔环境的电化学条件下进行。经过热处理的Freedom Plus在阳极极化过程中在表面上形成不稳定的氧化膜，并且在Fusayama溶液中似乎有缝隙腐蚀的趋势。;随着高钯合金在金属陶瓷和全金属修复体中的广泛使用在许多国家，最近已经公开了与这些合金有关的许多不利影响。这项研究提供了有关钯和某些钯化合物生物相容性的公开信息的系统总结。讨论了当前有关高钯牙科合金生物相容性的文献，并特别注意某些可能在体内起重要作用的冶金和微观结构因素。根据当前可获得的信息，高钯牙科合金似乎是生物相容性材料，除了某些人群中与这些合金相关的超敏性问题。在开发出一种可靠的方法来测试对象对高钯合金的过敏性之前，牙医仍然有责任为患者选择合适的牙科合金。

著录项

  • 作者

    Cai, Zhuo.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Health Sciences Dentistry.;Engineering Metallurgy.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 121 p.
  • 总页数 121
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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