Encontrados 16 documentos, a visualizar página 1 de 2
Corrosion behaviour of titanium in the presence of Streptococcus mutans
Souza, J. C. M.; Ponthiaux, Pierre; Henriques, Mariana; Oliveira, Rosário; Teughels, W.; Celis, J. P.; Rocha, L. A.Objective The main aim of this in vitro study was to evaluate the influence of Streptococcus mutans on the corrosion of titanium. Methods S. mutans biofilms were formed on commercially pure titanium (CP-Ti) square samples (10 mm × 10 mm × 1 mm) using a culture medium enriched with sucrose. Open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements were used to evaluate the cor...
Simultaneous degradation by corrosion and wear of titanium in artificial saliva...
Souza, J.C.M; Barbosa, S. L; Ariza, E.; Celis, J-P.; Rocha, L. A.Article in press ; The degradation of titanium-based oral rehabilitation systems can occur by corrosion and wear processes taking place simultaneously (tribocorrosion) and influenced by the presence of fluorides. In this study, the tribocorrosion behavior of titanium in artificial saliva solutions containing fluorides is investigated. Before sliding tests were started up, electrochemical measurements such as o...
Tribological behaviour of oral mixed biofilms
Cruz, Helena Margarida Vaz; Henriques, Mariana; Rocha, L. A.; Celis, J. P.The use of dental implants has been increasing even though failures do occur. The presence of wear debris and oral microorganisms can contribute to infections and jeopardize implant integration. The aim of this work was to study the influence of mixed biofilms in the tribological behaviour of commercially pure titanium for dental implants under different concentrations of fluoride. Samples of titanium with two ...
Effect of oral biofilms on the biotribocorrosion of titanium
Souza, J. C. M.; Ariza, E.; Henriques, Mariana; Oliveira, Rosário; Teughels, W.; Rocha, L. A.; Celis, J. P.The oral cavity is a complex environment where corrosive substances from dietary, human saliva and oral biofilms may accumulate in retentive areas of implant-supported prostheses promoting a corrosion of their surfaces. On the other side, during mastication, micro-movements may occur in artificial joints causing a relative contact motion between surfaces. Both processes result in a tribocorrosion system. The ob...
Wear and corrosion of titanium in oral simulating environments
Souza, J. C. M.; Ariza, E.; Henriques, Mariana; Oliveira, Rosário; Teughels, W.; Rocha, L. A.; Celis, J. P.The oral cavity can be considered as an aggressive environment to restorative materials considering that several acidic substances can be retained in the saliva and biofilms as well as loads from mastication and abrasive particles take place in the wear of oral surfaces. The objective of this work is to investigate the in-vitro corrosion and wear in fluoridated artificial saliva and in presence of biofilms. Ele...
Biotribocorrosion behavior of titanium in the presence of biofilms
Souza, J. C. M.; Ariza, E.; Henriques, Mariana; Oliveira, Rosário; Teughels, W.; Rocha, L. A.; Celis, J. P.In the oral cavity, restorative surfaces such as of titanium-based implant systems are in contact with several acidic substances originated from dietary intake and microbial metabolism. During the mastication, a simultaneous corrosion-wear process known by Biotribocorrosion can take place on the surfaces which are in relative contact motion. The objective of this work is to investigate the in-vitro simultaneous...
Tribocorrosion of commercially pure titanium in artificial saliva containing fl...
Souza, J. C. M.; Barbosa, S. L.; Henriques, Mariana; Oliveira, Rosário; Rocha, L. A.; Celis, J. P.According to several studies, commercially pure (cp) titanium presents the required properties for dental applications such as mechanical resistance, low density, corrosion resistance and biocompatibility [1-3]. Also, it is widely accepted that the surface properties of the metallic material will play an essential role in the interaction between implanted materials and tissue. Whatever Ti is used in crowns or i...
Influence of pH and corrosion inhibitors on the tribocorrrosion of titanium in ...
Vieira, A. C.; Ribeiro, A. R.; Rocha, L. A.; Celis, J. P.Dental implants are used to replace teeth lost due to decay, trauma, or periodontal iseases. Dental implants are most of the times ubjected tomicro-movements at the implant/bone interface or implant/porcelain interface (due to the transmitted mastication loads) and chemical solicitations (oral environment). Such implant becomes part of tribocorrosion system, which may undergo a complex degradation process that...
Physical, chemical and topographic characterization of titanium surface oxide l...
Ribeiro, A. R.; Nascimento, R. M.; Celis, J. P.; Gomes, J. R.; Martinelli, A. E.; Rocha, L. A.Titanium and titanium alloys have been widely used in orthopeadics and dental implants because of their excellent properties such as low modulus, good fatigue strength, good corrosion resistance and biocompatibility. However, their poor wear resistance still limits their application. When inserted in the oral environment dental implants are under a complex degradation phenomenon as a result of the combined acti...
Tribocorrosion behaviour of titanium grade 2 in alternative linear regime of sl...
Ribeiro, Ana; Rocha, L. A.; Ariza, E.; Celis, J. P.The demand for metallic materials in medical and dental devices is large; metals and alloys are widely used as biomedical materials and are indispensable in the medical field. In particular, toughness, elasticity, rigidity, and, some times, electrical conductivity are essential properties for metallic materials used in medical devices. In dentistry, titanium is used for restorations, orthodontic wires, and dent...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||