title: Tribocorrosion behavior of veneering biomedical PEEK to Ti6Al4V structures.
abstract: In dentistry, prosthetic structures must be able to support masticatory loads combined with a high biocompatibility and wear resistance in the presence of a corrosive environment. In order to improve the simultaneous wear and corrosion response of highly biocompatible prosthetic structures, a veneering poly-ether-ether-ketone (PEEK) to Ti6Al4V substrate was assessed by tribocorrosion analyses under conditions mimicking the oral environment. Samples were synthesized by hot pressing the PEEK veneer onto Ti6Al4V cylinders. The tribocorrosion tests on Ti6Al4V or PEEK/Ti6Al4V samples were performed on a reciprocating ball-on-plate tribometer at 30N normal load, 1Hz and stroke length of 3mm. The tests were carried out in artificial saliva at 37°C. Open circuit potential (OCP) was measured before, during and after reciprocating sliding tests. The worn surfaces were characterized by scanning electron microscopy. The results revealed a lower wear rate on PEEK combined with a lower coefficient of friction (COF), when compared to Ti6Al4V. In fact, PEEK protected Ti6Al4V substrate against the corrosive environment and wear avoiding the release of metallic ions to the surrounding environment.
authors.affiliation: CMEMS - Center for Microelectromechanical Systems, University of Minho, Azurém, 4800-058 Guimarães, Portugal.
authors.forename: Miguel
authors.initials: M
authors.lastname: Sampaio
authors.affiliation: Cross-Border Faculty of Humanities, Economics and Engineering, "Dunărea de Jos" University of Galaţi, Domnească 47, 800008 Galati, Romania.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Buciumeanu
authors.affiliation: CMEMS - Center for Microelectromechanical Systems, University of Minho, Azurém, 4800-058 Guimarães, Portugal.
authors.forename: Bruno
authors.initials: B
authors.lastname: Henriques
authors.affiliation: CMEMS - Center for Microelectromechanical Systems, University of Minho, Azurém, 4800-058 Guimarães, Portugal.
authors.forename: Filipe S
authors.initials: FS
authors.lastname: Silva
authors.affiliation: CMEMS - Center for Microelectromechanical Systems, University of Minho, Azurém, 4800-058 Guimarães, Portugal; School of Dentistry, Post-Graduation Program in Dentistry (PPGO), Federal University of Santa Catarina (UFSC), Campus Trindade, Florianópolis, SC 88040-900, Brazil. Electronic address: julio.c.m.souza@ufsc.br.
authors.forename: Júlio C M
authors.initials: JC
authors.lastname: Souza
authors.affiliation: CMEMS - Center for Microelectromechanical Systems, University of Minho, Azurém, 4800-058 Guimarães, Portugal.
authors.forename: José R
authors.initials: JR
authors.lastname: Gomes
mesh_terms: D000497:Alloys; D001577:Benzophenones; D001672:Biocompatible Materials / Q000737:chemistry*; D003343:Corrosion; D007659:Ketones / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D001577:Benzophenones; D001672:Biocompatible Materials; D007659:Ketones; D011108:Polymers; C031462:titanium alloy (TiAl6V4); C063834:polyetheretherketone; D011092:Polyethylene Glycols; D014025:Titanium
keywords: Biotribology; PEEK; Sliding wear; Ti6Al4V; Tribocorrosion