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Corrosion under stress of materials composing dental amalgam

✍ Scribed by Johnson, L. B. ;Lawless, K. R.

Publisher: John Wiley and Sons
Year: 1969
Tongue: English
Weight: 329 KB
Volume: 3
Category: Article
ISSN: 0021-9304
DOI: 10.1002/jbm.820030403

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✦ Synopsis

Corrosion potentials of materials composing dental amalgam have been measured in artificial saliva as the specimens were subjected to an increasing tensile load. Further, tensile tests have been carried out on specimens which had been previously subjected to controlled corrosion.

The corrosion potentials of Cu, Ag, Zn, Ag2Hg3, Ag3Sn and finished dental amalgam showed only a slight increase in the anodic direction as the load increased. The potentials of Sn and Sn amalgams, on the other hand, showed a considerable increase.

Most of the above results were explained as being a consequence of the rupture and repair of protective films as stress was applied or released. For Sn, however, it was necessary to postulate a complex attack by the corrodant to explain the large potential change.

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