Papers by Author: D. Ionita

Abstract: The paper reports the behavior of TiNbZrTa in biological solution which simulates the body conditions (SBF-simulated body fluids) with different pH values. It has determinate the ion release quantities in time in SBF and the passive layer transformation on the implant surface. The used techniques were ICP-MS, FT-IR and contact angle measurement.

Abstract: In this paper the elaboration and characterization of TiO2 nanotubes as a function of anodizing conditions are studied taking into consideration electrolyte composition and voltage. The obtained results show that the nanotubes dimensions and surface features depend on elaboration conditions. The technique of surface characteristics investigation (2D and 3 D images) was atomic force microscopy which permitted roughness and porosity evaluation.

Abstract: The purpose of this study is the obtaining of different orthopedic materials and chemical and mechanical characterization. The chemical tests used were setting time, water absorption and from the point of view of mechanical properties the Young modulus, compressive strength, and maximum strength. Also, the surface of orthopedic bioceramics materials was characterized by porosity test.

Abstract: The paper is an electrochemical study regarding the influence of different acid etching conditions on the corrosion behaviour of a new Ti based bioalloy with Nb, Ta and Zr. Open circuit, potentiodynamic and electrochemical impedance spectroscopy were the methods performed in a simulated body fluid (SBF) and a stability mechanism was discussed in terms of equivalent circuits.

Abstract: The aim of this paper is to evaluate using ICP/MS (inductively coupled plasma mass spectrometry method ) the small amount of heavy metal existing in temporary teeth of children from area with high environmental risk regarding heavy metals, and to correlate this amount with the state of degradation of such teeth, taking into account that teeth are biological archive.

Abstract: The aim of this paper is to correlate surface features of degraded temporary teeth from area with high pollution with the cell adhesion and proliferation. Viability of gingival fibroblast (HGF-1, CRL-2014, American Type Culture Collection) was evaluated with a MTT (3-(4,5-dimetiltiazol-2-il)-2,5-difeniltetrazolium bromide ) test and the values are discussed for the most degraded temporary teeth in correlation with the change in surface morphology and hydrophilic/hydrophobic balance, taking into account that cell adhesion is related to a more hydrophilic character.

Abstract: The aim of this paper was to find and establish the contact: biomaterial implant (TiAlZr) - coated with biologically active molecules; and the correlation between surface characteristics and their efficiency.

Abstract: The corrosion behavior of titanium alloys and 316L stainless steel has been evaluated and compared with coated materials. The corrosion current and the corrosion rate were evaluated by electrochemical techniques. The ions release from titanium alloys and 316L stainless steel were analyzed using ICP-MS and the HA coatings were observed using FTIR analysis.

Abstract: The goal of this paper is elaboration and characterization of chemical and electrochemical phosphate deposition on titanium. The behavior of the bioactive coating was evaluated using electrochemical methods (open circuit potential, cyclic voltametry) and spectroscopy (FTIR and atomic adsorbtion spectroscopy).