fa Corrosion behaviour of titanium in the presence of Streptococcus mutans پریودنتولوژی Periodontology پژوهشي Research <p> <strong>Objective </strong></p><p> The main aim of this in vitro study was to evaluate the influence of Streptococcus mutans on the corrosion of titanium.</p><p> <strong> Methods</strong></p><p>  S. mutans biofilms were formed on commercially pure titanium (CP-Ti) square samples (10mm×10mm×1mm) using a culture medium enriched with sucrose. Open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements were used to evaluate the corrosion behaviour of CP-Ti in the presence of S. mutans in Fusayama's artificial saliva. The corrosion of biofilm-free CP-Ti samples was also evaluated in artificial saliva. Biofilms biomass was measured by spectrophotometry, using crystal violet staining, after 1, 2 and 7 days.</p><p> <strong> Results</strong> </p><p> The OCP values recorded on CP-Ti in the presence of S. mutans (−0.3±0.02V vs. SCE) was lower than those on biofilm-free CP-Ti (−0.1±0.01V vs. SCE) after 2h of immersion in artificial saliva (p<0.05). That reveals a high reactivity of titanium in presence of S. mutans. Impedance spectra revealed the formation of a compact passive film on titanium in artificial saliva or in the presence of a 2 days old S. mutans biofilm even though the corrosion resistance of CP-Ti has decreased in presence of a S. mutans biofilm. </p><p> <strong>Conclusion</strong></p><p>  The presence of bacterial colonies, such as S. mutans, negatively affected the corrosion resistance of the titanium. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry</p><p> <a href="http://www.jodjournal.com/article/S0300-5712(13)00088-2/abstract" target="_blank"><font color="#0000ff">Full Text</font></a></p> Streptococcus mutans, Biofilm, Fluorides, Titanium, Corrosion 0 0 http://idai.ir/browse.php?a_code=A-10-32-2161&slc_lang=fa&sid=1 Júlio C.M. Souza 100319475328460010153 100319475328460010153 Yes Centre for Mechanical and Materials Technologies, CT2M, Universidade do Minho, P-4800-058 Guimarães, Portugal Pierre Ponthiaux 100319475328460010154 100319475328460010154 No Ecole Centrale Paris, Chemical Engineering Laboratory (LGPM), F-92290 Châtenay-Malabry, France Mariana Henriques 100319475328460010155 100319475328460010155 No IBB – Institute for Biotechnology and Bioengineering, Universidade do Minho, P-4710-057 Braga, Portugal Rosário Oliveira 100319475328460010156 100319475328460010156 No IBB – Institute for Biotechnology and Bioengineering, Universidade do Minho, P-4710-057 Braga, Portugal Wim Teughels 100319475328460010157 100319475328460010157 No Department of Periodontology, KU Leuven, Leuven B-3000, Belgium Jean-Pierre Celis 100319475328460010158 100319475328460010158 No Department of MTM, KU Leuven, Leuven B-3001, Belgium Luís A. Rocha 100319475328460010159 100319475328460010159 No Centre for Mechanical and Materials Technologies, CT2M, Universidade do Minho, P-4800-058 Guimarães, Portugal