PALLADIUM CONTAINING DENTAL AMALGAM

含钯牙科汞合金

• 批准号: 3220520
• 负责人: EVAN H GREENER
• 金额: $ 15.3万
• 依托单位: NORTHWESTERN UNIVERSITY AT CHICAGO
• 依托单位国家: 美国
• 财政年份: 1984
• 资助国家: 美国
• 起止时间: 1984-09-01 至 1990-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/3220520
• 关键词: X ray crystallography; biomaterial development /preparation; copper; dental amalgam; dental materials; electrochemistry; metal dental material; palladium; tin

Although dental amalgams remain the most popular restorative material today, many questions have arisen relating to mechanical, corrosion and biocompatibility of contemporary materials. Our objective is the development of new compositional concepts in dental amalgam through the addition of Pd and other noble metal alloys in small concentrations. Modification of compositions and resulting microstructures of amalgams should result in dental restoratives of markedly improved mechanical and corrosion properties. Given the apparent affinity between Pd and Hg, it is hoped that the Hg vapor pressure over these amalgams will be significantly reduced. Both single composition and blended amalgams will be fabricated from alloys utilizing Pd substitution for major amalgam alloy components (Ag,Cu,Sn). Structural and phase relationships of resulting amalgams will be determined by modern ultrastructural techniques. New reaction products, once identified, will be fabricated and likewise studied. Amalgams whose improved properties have been already determined will be further refined through optimization of clinical variables. Mechanisms of property improvement associated with the formation of new Pd reaction products will be determined by aid of ultrastructural analysis. Conventional electrochemical techniques will be supplemented by atomic absorption to determine changes in released ions through compositional modification. Hg vapor pressure over amalgams and constituent phases will be measured. Controls will be blended and single composition contemporary commercial amalgams. Amalgams whose Pd concentrations have been optimized will be further refined by minor additions of other noble metals and similarly studied.

尽管牙科汞合金仍然是最受欢迎的修复材料 今天的材料中，出现了许多与机械有关的问题， 现代材料的腐蚀和生物相容性。 我们的目标是开发新的作曲概念 添加钯和其他贵金属的牙科汞合金 小浓度的合金。 组合物的修改和 由此产生的汞合金微观结构应导致牙科 显着改善机械性能和腐蚀的修复体 特性。 鉴于 Pd 和 Hg 之间的表观亲和力， 希望这些汞齐上的汞蒸气压为 显着减少。 既有单一成分，也有混合成分 汞齐将由利用钯替代的合金制成 适用于主要汞齐合金成分（Ag、Cu、Sn）。 结构和 所得汞齐的相关系将由下式确定 现代超微结构技术。 新反应产物一次 已确定，将被制作并进行同样的研究。 汞合金 其改进的性能已经确定将是 通过优化临床变量进一步完善。 与形成相关的性能改善机制 新的 Pd 反应产物将通过以下方法确定 超微结构分析。 传统电化学技术 将补充原子吸收以确定变化 通过成分修饰释放离子。 汞蒸气 将测量汞齐和组成相的压力。 控制将是混合的，单一的组合是现代的 商业汞合金。 Pd 浓度已达到的汞齐 优化将通过其他贵族的少量添加进一步完善 金属并进行了类似的研究。