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PALLADIUM CONTAINING DENTAL AMALGAM

含钯牙科汞合金

基本信息

批准号：
3220521
负责人：
EVAN H GREENER
金额：
$ 12.89万
依托单位：
NORTHWESTERN UNIVERSITY AT CHICAGO
依托单位国家：
美国
项目类别：
财政年份：
1984
资助国家：
美国
起止时间：
1984-09-01 至 1991-03-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/3220521
关键词：
X ray crystallography biomaterial development /preparation copper dental amalgam dental materials electrochemistry metal dental material palladium tin

项目摘要

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.

尽管牙科银汞合金仍然是最受欢迎的修复材料今天的材料，出现了许多与机械，当代材料的腐蚀性和生物相容性。我们的目标是发展新的构图概念添加钯和其他贵金属的牙科银汞合金小浓度的合金。组合物的修改和由此产生的银汞合金的微观结构应该导致牙科机械性能和腐蚀性能显著改善的修复剂属性。鉴于钯和汞之间的明显亲和力，它是希望这些汞齐上的汞蒸汽压将是显著减少。单一成分和混合成分汞齐将由使用Pd替代的合金制成适用于主要的汞合金成分(银、铜、锡)。结构和由此产生的汞齐的相关系将通过以下方式确定现代超微结构技术。新的反应产品，一次将被证实，将被捏造和同样的研究。汞齐已经确定了其改进的属性将是通过临床变量的优化进一步细化。与形成相关的性能改善机制新的Pd反应产物的数量将通过以下方式确定超微结构分析。常规电化学技术将由原子吸收来补充，以确定通过成分修饰释放离子。汞蒸气将测量汞齐和组成相上的压力。控制将是混合的和当代的单一成分商用汞合金。其钯浓度一直是优化将通过少量添加其他高贵元素来进一步提炼金属和类似的研究。