title: The durability of parylene coatings on neodymium-iron-boron magnets.
abstract: A parylene coating is frequently used to prevent corrosion of neodymium-iron-boron magnets when they are used intra-orally. This in vitro study was designed to test the durability of parylene coating in a simulated oral environment. Single and double parylene-coated magnets were subjected to grinding and crushing forces in an industrial ball mill. The results demonstrate that abrasion and wear was visible around the edges after 1 hour of testing, with a breach of the coating noted under high magnification scanning electron microscopy (SEM). The conclusion of the study is that parylene coating is unlikely to withstand intra-oral forces. The shape of the magnets, the manufacturing process involved in their production, and the thickness of the parylene coating are important factors to consider with respect to the durability of magnets used in the mouth.
authors.affiliation: Department of Orthodontics, Eastman Dental Institute for Oral Health Sciences, University College London, UK.
authors.forename: J H
authors.initials: JH
authors.lastname: Noar
authors.forename: A
authors.initials: A
authors.lastname: Wahab
authors.forename: R D
authors.initials: RD
authors.lastname: Evans
authors.forename: A G
authors.initials: AG
authors.lastname: Wojcik
mesh_terms: D001895:Boron; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003343:Corrosion; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D006801:Humans; D066298:In Vitro Techniques; D007501:Iron; D008280:Magnetics / Q000295:instrumentation*; D008422:Materials Testing / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D008855:Microscopy, Electron, Scanning; D009354:Neodymium; D011108:Polymers / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014992:Xylenes / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D011108:Polymers; D014992:Xylenes; C011055:parylene; D009354:Neodymium; D007501:Iron; D001895:Boron