Title: 0360 - Biomimetic Surface Functionalization of a TiZr Alloy for Dental Implants
Jairo Cordeiro (Presenter)
University of Campinas (UNICAMP)
Valentim Barão, University of Campinas (UNICAMP)
Heloisa Pantaroto, University of Campinas (UNICAMP)
Emanuella Paschoaleto, University of Campinas (UNICAMP)
Elidiane Rangel, São Paulo State University (UNESP), Engineering College
Nilson da Cruz, São Paulo State University (UNESP), Engineering College
Cortino Sukotjo, University of Illinois at Chicago
Objectives: This study synthesized a biofunctional coating for a Ti15Zr alloy (Roxolid®, Institut Straumann AG) and evaluated the surface characteristics, the electrochemical behavior, and the biological properties of this implant material in three versions: machined, SLA®-treated (control groups) and modified by micro-arc oxidation (MAO) (experimental group).
Methods: Discs (15mm x 1mm) of all groups were obtained and characterized by means of scanning electron microscopy, dispersive energy spectroscopy, X-ray diffraction, profilometry, surface free energy and Vickers microhardness. Electrochemical tests were performed in a body fluid solution (pH 7.4) to assess the corrosive behavior of the surfaces. The bicinchoninic acid method was used to measure the albumin protein adsorption, and the adhesion of Streptococcus sanguinis was verified. Data were statistically analyzed (1-way ANOVA and Tukey test, α=0.05).
Results: MAO generated a porous topography with hardness and surface free energy statistically significantly higher than that of the other groups (p<0.05). SLA surface exhibited sandblasting holes with superposition of small pits, which promoted increased surface roughness (p<0.05). MAO treatment showed greater electrochemical stability, enhancing the polarization resistance and the corrosion potential, and decreasing the capacitance and the corrosion current density values (p<0.05). In addition, MAO surface improved the albumin adsorption (p<0.05), and was unfavorable to biofilm adhesion.
Conclusions: MAO appears to be a suitable option for Ti15Zr alloy in dental implant manufacturing. This surface displayed promising surface characteristics and electrochemical behavior, and was able to enhance the adsorption of albumin on the material with fewer tendencies to bacterial adhesion.
This abstract is based on research that was funded entirely or partially by an outside source:
São Paulo State Research Foundation (FAPESP), Brazil (grant numbers 2016/11470-6 and 2017/01320-0) and Brazilian National Council for Scientific and Technological Development (CNPq) (grant number 137562/2016-0) .
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE