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https://doi.org/10.37358/Rev.Chim.1949

OSIM Nr. R102355
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Revista de Chimie (Rev. Chim.), Year 2012, Volume 63, Issue 2,





Lavinia Ardelean, Lucien Reclaru, Christian Susz, Laura CRISTINA Rusu
Scanning Electron Microscopy and Energy-dispersive X-ray Spectroscopy in Determining the Metallic-shine-loss Causes
of a Low Gold Content Conventional Alloy

Abstract:

The aim of this study is to determine the causes which lead to a significant colour change and loss of the metallic shine of a 4-element bridge made of a low-gold-content conventional alloy, only a few months after cementation. The authors used scanning electron microscopy (SEM) with retrodiffused electrons and energy-dispersive X-ray spectroscopy (EDX), applied to the restoration surface and in transversal section. The failure occurred due to the incorrect melting conditions of the alloy which leads to internal porosities and areas with very different superficial composition. On the other hand, the improper polishing of the surface led to diminished corrosion resistance and the degradation of the prosthetic piece only a few months after cementation in the mouth. Keywords corrosion, scanning electron microscopy, retrodiffused electrons, energy-dispersive X-ray spectroscopy, low-gold-content conventional alloy


Issue: 2012, Volume 63, Issue 2
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