Encontrados 9 documentos, a visualizar página 1 de 1
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...
Biotribocorrosion behavior of titanium in simulated oral environments
Souza, J. C. M.Tese de Doutoramento em Engenharia Biomédica ; The oral cavity is a complex environment where corrosive substances from dietary, human saliva and oral biofilms may accumulate in retentive areas of dental implant systems and prostheses promoting corrosion at their surfaces. Additionally, during mastication, micro-movements may occur in artificial joints causing a relative motion between contacting surfaces, lea...
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...
Efeito da condensação e queima na formação de defeitos microestruturais em cerâ...
Souza,J. C. M. de; Nascimento,R. M. do; Martinelli,A. E.As cerâmicas feldspáticas dentárias são rotineiramente empregadas para reconstruções protéticas dentárias unitárias ou extensas, associadas a uma subestrutura metálica. Tendo em vista a sensibilidade técnica na confecção deste tipo restauração dentária, o objetivo deste estudo foi analisar a influência de múltiplas queimas e técnicas de condensação na presença de defeitos na microestrutura de cerâmicas feldspát...
Chemical, thermal and particle distribution analyses of two low-fusing dental p...
Souza, J. C. M.; Nascimento, R. M.; Martinelli, A. E.; Rocha, L. A.Low-fusing dental porcelains are commonly used for the fabrication of aesthetic restorations to prevent oxidation of NiCrMo, CoCrMo and titanium substructures. The aim of this study was to characterize one feldspar-based commercial porcelain in order to obtain information on the chemical composition, thermal expansion and particle size distribution. Opaque and dentin commercial porcelains have been selected for...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||