Andrey N. Gribov

Nanostructure of biocompatible titania/hydroxyapatite coatings

The article describes prospective composite biocompatible titania coatings modified with hydroxyapatite nanoparticles and obtained on intraosseous implants fabricated from commercially pure titanium VT1-00. Consistency changes of morphological characteristics, crystalline structure, physical and mechanical properties and biocompatibility of experimental titanium implant coatings obtained by the combination of oxidation and surface modification with hydroxyapatite during induction heat treatment are defined.

Induction heat treatment and technique of bioceramic coatings production on medical titanium alloys

Prospective composite bioceramic titania coatings were obtained on intraosseous implants fabricated from medical titanium alloy VT16 (Ti-2.5Al-5Mo-5V). Consistency changes of morphological characteristics, physico-mechanical properties and biocompatibility of experimental titanium implant coatings obtained by oxidation during induction heat treatment are defined. Technological recommendations for obtaining bioceramic coatings with extremely high strength on titanium items surface are given.

Titania coatings for high-tech devices

The article describes nanostructured titania coatings obtained on the surface of high-tech titanium devices. Consistency changes of the micro- and nanostructure, physico-mechanical and tribological characteristics of experimental coatings obtained by the induction heat treatment are defined.

Effect of thermal shock loadings on stability of dentin-composite polymer material adhesive interfaces

In the past several decades the problem of longevity and durability of adhesive interfaces between hard tooth tissues and composite resin-based materials are of great interest among dental researchers and clinicians. These parameters are partially determined by adhesive system mechanical properties. In the present research project nanoindentation has been examined to test hardness of dental adhesive systems. A series of laboratory experiments was performed to study the effect of light curing time and oxygen inhibition phenomenon on light-cured adhesive material hardness. An adhesive system AdperTM Single Bond (3M ESPE) was selected as a material for testing. The analysis of experimental data revealed that the maximum values of hardness were observed after the material had been light-cured for 20 seconds, as outlined in guidelines for polymerization time of the adhesive system. The experimental studies of oxygen inhibition influence on adhesive system hardness pointed out to the fact that the dispersive layer removal led to increase in adhesive system hardness. A long – time exposure of polymerized material of adhesive system at open air at room temperature resulted in no changes in its hardness, which was likely to be determined by the mutual effect of rival processes of air oxygen inhibition and directed light curing.

Nanostructured titania and plasma-spraying hydroxyapatite coatings obtained by induction heat treatment

The study focuses on the prospective nanostructured plasma-spraying and oxide coatings obtained on commercially pure titanium. Consistency changes of morphological characteristics and crystalline structure, physical, mechanical properties and biocompatibility of titania/hydroxyapatite coatings obtained by the combination of plasma spraying and induction heat treatment are defined.

XRD study of calcium-phosphate crystal formation on dentine surface

The characteristic sizes of elementary crystallites in the composition of dentine substrate with calciumphosphate crystal formations on its surface have been studied using x-ray diffraction (XRD) analysis for phase identification. Most probable mechanisms explaining changes in elementary crystallite sizes in the process of crystal formation were discussed.