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The purpose of this study is to find out the analytical accuracy and the detection limit of the EPMA, which are the important factors when analyzing the changes in the surface condition or the composition of the dental metals used in an oral environment. The results were as follows: 1) The EPMA used in the analysis had an excellent detection limit which was less than 0.005% for Fe, Cr, Si, Cu and Mo. 2) The X-ray detection limit measured for the elements in the alloys were close to that of the pure elements. 3) The results of the quantitative analysis for the standard samples using the EPMA were close to the results of the chemical analysis for each of the samples, with their differences within 1%. 4) When the quantitative results between the mirror polished surfaces and the surfaces treated with different grits of Emery papers were compared, the error was within 1% for the major component elements even when treated with the rough #80 Emery paper. 5) The effects of the inclination of the sample surfaces on the results of the analysis were small for the non-precious metals. Even with the precious metals, it was within 1% of the measurement error when the inclination was less than 2 degrees.

Surface changes of dental alloys in oral environment. Part 1. Accuracy of EPMA analysis and its applicability to estimate corrosion of dental alloys.