PALLADIUM CONTAINING DENTAL AMALGAM

含钯牙科汞合金

• 批准号: 3220518
• 负责人: EVAN H GREENER
• 金额: $ 13.56万
• 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/3220518
• 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.

虽然牙科汞合金仍然是最受欢迎的修复 材料的今天，许多问题已经出现了有关机械， 现代材料的腐蚀性和生物相容性。 我们的目标是发展新的作曲概念， 通过添加Pd和其他贵金属的牙科汞合金 小浓度的合金。 组合物的改性和 汞合金的微观结构应导致牙科 显著改善机械性能和腐蚀性能的替代品 特性. 考虑到Pd和Hg之间的表观亲和力， 希望这些汞合金上的汞蒸气压 大幅减少。 单一成分和混合成分 汞合金将由采用Pd替代的合金制成 主要汞齐合金成分（银、铜、锡）。 结构和 所得到的汞合金的相关系将通过以下方式确定： 现代超微结构技术。 新的反应产物，一旦 将被发现，并进行研究。 汞合金 其改进的性能已经确定， 通过优化临床变量进一步细化。 与形成相关的性能改进机制 新的Pd反应产物的量将通过以下方法确定： 超微结构分析 常规电化学技术 将辅以原子吸收，以确定 通过成分改变释放离子。 汞蒸气 将测量汞合金和组成相上的压力。 控制将是混合和单一组成当代 商业汞合金。 钯浓度已达到 优化后将通过少量添加其他贵金属来进一步完善 金属和类似的研究。