Home Subscription Services

Quintessence International
QI Home Page
About the Editor
Editorial Board
Accepted Manuscripts
Author Guidelines
Submission Form
Reprints / Articles
Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

July/August 2007
Volume 38 , Issue 7

Share Abstract:

Comparative electrochemical investigation of the effect of aging on corrosion of dental amalgam

Wala M. Amin, PhD, MSc, BDS

PMID: 17694206

Objective: To investigate corrosion in dental amalgam and evaluate the effects of composition and long-term aging on the alloy’s corrosion behavior. Method and Materials: A sample of high-copper and low-copper formulations was employed. Corrosion tests were performed using a 3-electrode polarization cell. Anodic polarization curves were drawn, and the potential and the current density corresponding to the first anodic peak were registered. Scanning electron microscopy was performed, and the different metallurgical phases of the alloy’s microstructure were examined and analyzed chemically using an energy-dispersive x-ray technique. The amalgams’ corrosion behavior was evaluated at 1 week and after aging in a simulated oral environment for 6 months, 1 year, and 2 years. Data were analyzed using analysis of variance (ANOVA)/Scheffé post hoc test at a .05 significance level. Results: The potential values recorded by the high-copper amalgam were higher (P < .05) than those scored by the low-copper alloy. This was attributed to the presence of a tin-mercury, g2, phase in larger quantities in the low-copper amalgam than in the high-copper alloy. For both formulations the potentials increased significantly (P < .05) by about 70 mV after 2 years. This was ascribed to the gradual elimination of the corrosion-susceptible g2 phase and formation of a tin-copper, h, phase, particularly in the high-copper amalgam. Conclusion: High-copper amalgam exhibited better resistance to corrosion than the low-copper alloy. Aging in a simulated oral environment improved corrosion behavior for both high- and low-copper amalgams. (Quintessence 2007;38:615.e417–424)

Key words: aging, anodic polarization, corrosion, high-copper amalgam, tin-copper (h) phase, tin-mercury (g2) phase

Full Text PDF File | Order Article


Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.
  © 2017 Quintessence Publishing Co Inc

Home | Subscription Services | Books | Journals | Multimedia | Events | Blog
Terms of Use | Privacy Policy | About Us | Contact Us | Advertising | Help | Sitemap | Catalog