title: Corrosion resistance of the Pt-Fe-Nb magnets for dental-casting.
abstract: Magnetic attachments have been used in clinical dental practice, but there is some difficulties associated with removable bridges. One possible solution is to make whole bridges of Pt-Fe magnet alloys and its abutment out of magnetic stainless steel by casting. In terms of castability and magnetic properties, the promising composition of the Pt-Fe-Nb magnet alloy is Pt-30.0 mass% Fe-0.6 mass% Nb and Pt-30.0 mass% Fe-0.5 mass% Nb-0.03 mass% Si. In the present study, the corrosion resistance of these alloys was investigated based on the elusion test, electrochemical behavior and surface characterization by EPMA analysis. The released elements from the Pt-Fe-Nb magnets were mainly Fe ions in quantities similar to that of stainless steel for biomedical use, and the Pt-Fe-Nb magnet alloy, the Pt-Fe-Nb-Si magnet alloy and platinum resembled each other in electrochemical behavior. The present findings suggest, that the Pt-Fe-Nb magnet alloy provides excellent corrosion resistance and has important clinical dental applications.
authors.affiliation: Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Haoka
authors.forename: T
authors.initials: T
authors.lastname: Kanno
authors.forename: Y
authors.initials: Y
authors.lastname: Takada
authors.forename: K
authors.initials: K
authors.lastname: Kimura
authors.forename: O
authors.initials: O
authors.lastname: Okuno
mesh_terms: D000704:Analysis of Variance; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D003735:Dental Casting Technique; D003781:Denture Retention / Q000295:instrumentation*; D004577:Electron Probe Microanalysis; D007501:Iron / Q000737:chemistry; D008280:Magnetics / Q000295:instrumentation*; D008422:Materials Testing; D009556:Niobium / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D011199:Potentiometry; D012825:Silicon / Q000737:chemistry; D013193:Stainless Steel / Q000737:chemistry; D013499:Surface Properties
chemical_list: D003722:Dental Alloys; D009556:Niobium; D013193:Stainless Steel; D010984:Platinum; D007501:Iron; D012825:Silicon