Tribocorrosion of Ti6Al4V and NiCr Implant Alloys: Effect of Galvanic Interaction
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Tribocorrosion of Ti6Al4V and NiCr Implant Alloys: Effect of Galvanic Interaction Camila Dias dos Reis Barros1 · Janaina Cardozo Rocha1 · Ivan Napoleão Bastos2 · José Antônio da Cunha Ponciano Gomes1 Received: 4 June 2020 / Revised: 10 August 2020 / Accepted: 19 August 2020 © Springer Nature Switzerland AG 2020
Abstract Micromovements that occur in the joint between dental prostheses and implants can lead to wear-induced degradation. This process can be enhanced by corrosion in the oral environment influenced by the presence of solutions containing fluoride. Moreover, the eventual galvanic interactions between NiCr and Ti alloys can accelerate the wear-corrosion process. In this work, the tribocorrosion process of Ti6Al4V and NiCr alloys used in dental implant rehabilitations immersed in fluoride solutions at different pH values was investigated. The galvanic interaction effect between the alloys was also assessed. Tribocorrosion tests in corrosive media were performed with isolated Ti6Al4V and NiCr alloys, followed by testing with both alloys in contact. The media selected were based on fluoride concentrations and pH values that are possible to be found in oral environments. Analysis of the surfaces after the tribocorrosion tests was carried out using confocal laser microscopy. The wear profile and volume losses were determined by confocal measurements. It was concluded that the galvanic interaction between the alloys increased the tribocorrosion resistance of Ti6Al4V, compared with that of the isolated Ti6Al4V alloy. Ti6Al4V coupled with NiCr reduced the electrochemical potential decay during sliding. The increased resistance was explained by the electrochemical shift of the Ti6Al4V potential from active dissolution to the passive domain. Keywords Tribocorrosion · Galvanic coupling · Implant · Ti · NiCr · Fluoride
1 Introduction
* José Antônio da Cunha Ponciano Gomes [email protected] Camila Dias dos Reis Barros [email protected] Janaina Cardozo Rocha [email protected] Ivan Napoleão Bastos [email protected] 1
LabCorr (Corrosion Laboratory), Department of Materials and Metallurgical Engineering (COPPE/ UFRJ), Federal University of Rio de Janeiro, Av. Horácio de Macedo, 2030 Bloco I Cidade Universitária, Rio de Janeiro Zip Code 21941‑972, Brazil
Department of Materials Engineering (IPRJ/UERJ), Rio de Janeiro State University, Rua Bonfim, 55 UERJ, Nova Friburgo, RJ Zip Code 28625‑570, Brazil
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Implant fixture, screw-retained abutment, and crown prostheses are components of a dental implant rehabilitation system. The crown is placed over the abutment component. The joint of abutment-implant attach consists of a male–female docking system with the implant fixture, held by screwing. The long success of dental implant rehabilitation depends on proper osseointegration and precise fitting of the joint formed between the crown and the implant. The screw-retained tightening supports the precise fitting and, together with the maintenance of joint settlement, are basic requisites t
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