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Corrosion investigation of two materials for implant supraconstructions coupled to a titanium implant
Author(s) -
RAVNHOLT GERT,
JENSEN JOHN
Publication year - 1991
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1991.tb01882.x
Subject(s) - titanium , implant , corrosion , materials science , dentistry , dental implant , metallurgy , medicine , surgery
Abstract – The corrosion of two materials for implant supraconstructions, a carbon fiber/PMMA composite and a silver‐palladium alloy, was investigated in vitro, the materials being galvanically coupled to a titanium implant. Corrosion current and pH of the electrolyte were monitored, and corrosion products were identified by powder X‐ray diffraction. The carbon composite and the silver‐palladium per se did not corrode, whereas a silver‐palladium specimen brazed with the recommended brazing alloy corroded unmistakably, yielding copper‐containing corrosion products. The action of local corrosion cells around the brazed joint is considered, and it is concluded that the two materials seem well suited for implant supraconstructions, provided that brazing the silver‐palladium can be avoided. Considering the clinical relevance of the experimental model used, it is concluded that the model is likely to predict a lower corrosion susceptibility than the one found in vivo.