Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Abstract

This study formed a biofunctional coating for a Ti15Zr alloy to improve the surface characteristics, the electrochemical behavior, and the biological properties of this implant material. Ti15Zr discs (15 mm in diameter  1 mm thickness) were obtained in three versions: machined, SLA Ò-treated (control groups), and modified by plasma electrolytic oxidation (PEO) (experimental group). Surface features such as topography, composition, surface roughness, surface free energy, and hardness were assessed. Electrochemical tests were conducted with body fluid solution (pH 7.4). The albumin protein adsorption was measured by the bicinchoninic acid method, and the adhesion of Streptococcus sanguinis was determined. The surface treatments modified the material's topography. SLA promoted surface roughness higher than that of the other groups, whereas PEO surfaces presented the highest values of hardness and surface free energy. PEO increased the polarization resistance and the corrosion potential, and decreased capacitance and corrosion current density values. In addition, plasma treatment improved the albumin adsorption without being favorable to biofilm adhesion. PEO appears to be the most promising alternative for Ti15Zr alloys, since it improved surface characteristics and electrochemical behavior, as well as enhancing the adsorption of albumin on the material surface with fewer tendencies to bacterial adhesion.

Characterization of chemically treated Ti-Zr system alloys for dental implant application

“…The LSCM images were obtained with lenses of 50× and 150× magnifications. VK-Analyzer software (Keyence v3.3.0.0) was used for image processing and surface area acquirement, which was achieved by the extrapolation of its measurements in images of 100 × 100 μm (50× magnification) [22]. The average roughness (Ra) (n = 5) and surface free energy (n = 5) were evaluated by a profilometer (Dektak 150-d; Veeco, Plainview, NY, USA) and an automated goniometer (Ramé-Hart 100-00; Ramé-Hart Instrument Co., Succasunna, NJ, USA), respectively [21].…”

Optimizing citric acid protocol to control implant‐related infections: Anin vitroandin situstudy

“…Our results should be further validated on in vivo studies of implant decontamination (associated with mechanical therapies) and later on regeneration or resective therapies around implants with CA‐treated surfaces, before it can be considered to be used on peri‐implantitis patients. Importantly, this in vitro study was carried out considering only Ti‐machined surfaces, which can be a limitation since different dental implant surfaces (eg, anodized, CaP, and hydroxyapatite‐based treatments) and compositions (eg, TiAlV, TiZr, and zirconia) can influence bacteria adhesion, biofilm formation, 50‐52 surface properties, and corrosion resistance 53,54 . Although most of dental implants nowadays have many different surface treatments, evaluating machined surfaces is still important, as it allows us to further evaluate any surface damaged caused by the chemical treatment tested on smooth surfaces (which still applies to polished implant collars and polished abutment or other implant components).…”

UV-Pre-Treated and Protein-Adsorbed Titanium Implants Exhibit Enhanced Osteoconductivity

“…The enhancement of osteoblastic activity may be attributed to the improved protein adsorption on titanium surfaces. Protein adsorption is known to be affected by various surface properties, such as roughness, organic impurities, chemical composition, van der Waals interactions, and hydrogen bonding [ 29 , 30 ]. Although many reports have described protein coating treatments of implant surfaces in the last decade, most titanium surface treatments require a period of several hours to several days [ 31 , 32 , 33 ].…”