title: Electrochemical evaluation of the corrosion resistance of cup-yoke-type dental magnetic attachments.
abstract: The corrosion resistance of different magnetic assemblies—Magfit DX800 (Aichi Steel), Gigauss D800 (GC), Hyper Slim 4013, and Hicorex Slim 4013 (Hitachi Metals)—were electrochemically evaluated using anodic polarization curves obtained in 0.9% NaCl solution at 37°C. Stainless steels (444, XM27, 447J1, and 316L) composing the magnetic assemblies were also examined as controls. This revealed that all of the magnetic assemblies break down at 0.6-1.1 V; however, their breakdown potentials were all still significantly higher (p<0.05) than that of 316L. The distribution of elements in the laser welding zone between the yoke and shield ring was analyzed using EPMA; except with Magfit DX800, where the Cr content of the shield ring weld was greater than that of 316L. These magnetic assemblies are expected to have good corrosion resistance in the oral cavity, as their breakdown potentials are sufficiently higher than the 316L commonly used as a surgical implant material.
authors.affiliation: Division of Dental Biomaterials, Tohoku University Graduate School of Dentistry.
authors.forename: Yukyo
authors.initials: Y
authors.lastname: Takada
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Takahashi
authors.forename: Akira
authors.initials: A
authors.lastname: Kikuchi
authors.forename: Taichi
authors.initials: T
authors.lastname: Tenkumo
mesh_terms: D003343:Corrosion; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D004563:Electrochemistry; D004867:Equipment Design; D008280:Magnetics; D008422:Materials Testing; D013193:Stainless Steel / Q000737:chemistry*; D014896:Welding
chemical_list: D013193:Stainless Steel