Influence of Nanoparticles Deposition Conditions on the Microarc Coatings Properties

The surface charge of biomaterials significantly contributes to such processes as protein adsorption or biofilm formation and consequently osseointegration bone tissue and implant. There are a set of methods to create a charge on dielectric biomaterials surface. One of the perspective methods of materials electrization is an introduction of the nanoparticles with appropriate biomedical properties into biomaterial. Boehmite AlO(OH) nanoparticles is perspective for the biomaterials surface modification due to its high surface area and positive charge. In this work, the investigations of microarc calcium phosphate biocoatings modified by boehmite nanoparticles on the Ti substrate were presented. A variation of the nanoparticles deposition parameters allowed producing calcium phosphate coatings with different morphology and boehmite nanoparticles size distribution. The investigations of the modified coatings by the transmission and scanning electron microscopy methods are presented in the work

Physicomechanical properties of the extracellular matrix of a demineralized bone

The article describes the results of a study of physicomechanical properties of a demineralized bone matrix of human cancellous and compact bones. A demineralized cancellous bone was shown to have the best characteristics of a porous system for colonization of matrices by cells. The ultimate stress and elasticity modulus of samples of demineralized femoral heads isolated in primary hip replacement was demonstrated to vary in wide ranges. The elasticity modulus ranged from 50 to 250 MPa, and the tensile strength varied from 1.1 to 5.5 MPa. Microhardness measurements by the recovered indentation method were not possible because of the viscoelastic properties of a bone material. To study the piezoelectric properties of samples, a measuring system was developed that comprised a measuring chamber with contact electrodes, a system for controlled sample loading, an amplifier-converter unit, and signal recording and processing software. The measurement results were used to determine the dependence of the signal amplitude on the dynamic deformation characteristics. The findings are discussed in terms of the relationship between the mechanical and electrical properties and the structure of the organic bone component

Physicomechanical properties of the extracellular matrix of a demineralized bone

The article describes the results of a study of physicomechanical properties of a demineralized bone matrix of human cancellous and compact bones. A demineralized cancellous bone was shown to have the best characteristics of a porous system for colonization of matrices by cells. The ultimate stress and elasticity modulus of samples of demineralized femoral heads isolated in primary hip replacement was demonstrated to vary in wide ranges. The elasticity modulus ranged from 50 to 250 MPa, and the tensile strength varied from 1.1 to 5.5 MPa. Microhardness measurements by the recovered indentation method were not possible because of the viscoelastic properties of a bone material. To study the piezoelectric properties of samples, a measuring system was developed that comprised a measuring chamber with contact electrodes, a system for controlled sample loading, an amplifier-converter unit, and signal recording and processing software. The measurement results were used to determine the dependence of the signal amplitude on the dynamic deformation characteristics. The findings are discussed in terms of the relationship between the mechanical and electrical properties and the structure of the organic bone component