Physical Properties Of Dental Materials Gold Alloys And Accesory Materials

Author : W. H. Swanger
Publisher : Forgotten Books
ISBN 13 : 9780428084400
Total Pages : 36 pages
Book Rating : 4.0/5 (844 download)

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Download or read book Analysis of Dental Gold Alloys (Classic Reprint) written by W. H. Swanger and published by Forgotten Books. This book was released on 2018-01-08 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Analysis of Dental Gold Alloys The study of the properties of dental gold alloys has been an im portant part of the general research on dental materials begun several years ago at the Bureau of Standards in cooperation with the Weinstein Research Laboratories.1 In conducting this work on the alloys it became necessary to determine their chemical compositions. About 40 alloys were analyzed by the author while employed by the Weinstein Research Laboratories as a research associate. The pur pose of this paper is to describe the methods used and to assemble them in a complete procedure for the analysis of materials of this kind. Dental gold alloys are, in general, composed chiefly of gold, silver, copper, and platinum. The proportionate amounts of these metals are usually of the order of 60 per cent of gold, 10 to 15 per cent of silver, 10 to 15 per cent of copper, and 10 per cent of platinum. Palladium is often substituted for part or all of the platinum. Many alloys contain small amounts of iridium and occasionally one is found to contain rhodium. Of the base metals besides copper, small amounts of nickel, manganese, zinc, and tin are found in many of the alloys and occasionally iron and magnesium occur. As many as nine of the above-named metals have been found in a single alloy. A number of these were undoubtedly present as impurities in the major constituents. No procedure for the complete analysis of such alloys is given in the literature. Many of the methods given for the determination of the noble metals proved to be inaccurate when applied to these alloys and had to be modified. A new method was used for the deter mination of iridium. For the determination of the base mete-ls it was found possible to adapt methods that are in general use, except that a new method was devised for the determination of tin. In connection with the study of the physical properties of dental gold alloys, it was desirable to determine their composition with the highest possible accuracy. This procedure was, therefore, developed with that end in view. Many of the details of the procedure can be (omitted when the accurate determination of all the constituents of the alloy is not required, as, for example, in control analyses. The various steps of the procedure are discussed in the order in which they would generally be carried out in making a complete analysis. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.