RUDN: RUDN scientists have improved titanium dental implants with graphene nanosloyers
RUDN researchers have created and tested a method for processing titanium dental implants. It turned out that theanoslos of graphene on the surface of titanium improve its interaction with stem cells,which are placed on the implant so that it better “takes root”.Thanks to this method ofprocessing, stem cells are better kept on the surface, multiply and turn into the desired cells.
Titanium is used to create dental implants. It is resistant to corrosion, is not dangerous to tissues, does not interact with the tissues of the body. To improve osseointengrania (contact between the implant and thetooth), cells are “deposited” on the titanium surface — fibroblasts, osteoblasts, chondrocytes and stem cells(mesenchymal stromal cells),which can differentiate (transform) into cartilage and bone tissues. Scientists continue to develop new ways of treating the surface of titanium that would improve its interaction with these cells.
“Toachieve good osseointegration, it is necessary to use osteogenicande cells, forexample, osteoblasts and mesenchymal stromal cells. Thefirst stage of the interaction of cells and implants is toflight adhesion (“adhesion”).It has been proven that the quality of adhesion is crucial for the ability of cells to reproduce and differentiate. And the differentiation of mesenchymalx stromalx cellscan depend on the surfaceof titanium,“- Candidate of Physical and Mathematical Sciences Ekaterina Gosteva, Associate Professor of the Basic Department of Nanotechnology and Microsystem Engineering of RUDN University.
A group of physicists, biologists and physicians of RUDN University for the first time proposed to modify the surface of titanium with graphene, and also considered other options — etching and anodizing. The first method is a chemical effect on titanium. The second is the creation of an oxide film on the surface of the metal using physical or electrochemical action. The graphene layers on titanium were created by deposition fromthe gas phase — a titanium substrate is placed in a gas that interactswith the metal produces the right compound on thesurface. The researchers tried different options for preparing titanium, and then grew stem cell cultures on itto find the most effective way.
The most pronounced structure of the titanium surface was in the sample, which was treated in a combined way — first etched in a mixture of hydrochloric and sulfuric acids, and then anodized. From the point of view of cell adhesion, the most effective was a sample with a graphene coating — it was created using ethanol, at a temperature of 950 ° C for 35 minutes.
“Anodizing and graphene coated with 50% ethanol content with a deposition temperature of 950 °C and 35 minutes of synthesis are more favorable for cell adhesion, reproduction and further differentiation compared to other samples. These results are an importantstage in the development of titanium implants for preclinical studies,” Candidate of Medical Sciences Alexander Dymnikov, Associate Professor of the Department of Maxillofacial Surgery, RUDN University.