Application of biocompatible coatings
Application of biocompatible Pateks and BioPateks coatings on the implants by PACVD method Uniqueness and distinctive characteristics:
- application of coatings, both in industrial and clinical conditions;
- the surface has hydrophilic and dielectric properties;
- coatings are applied simultaneously with the substrate sterilization;
- amorphous state and increased adhesive strength of the coatings;
- application of coatings on specified local areas.
General data about the technology
The process is based on chemical deposition of coatings from vapor phase in terms of plasma activation (PACVD) without any use of vacuum and specialized chambers. Coating are applied at local exposure of high-speed atomic and molecular plasma flow with the surface being treated and its simultaneous plasma activation and sterilization. For that purpose a compact plasma-chemical reactor, cyclically moving with regard to treated surfaces being treated, is used. The items may also move with regard to a stationary plasma-chemical reactor. The coating is formed as a result of chemical reactions taking place close to the surface, on the surface and in the near-surface layer of the implant substrate. In this case, the main activation effects of plasma exposure, related to thermal and gas-dynamic properties of the plasma flow, availability of a directed flux of ionized and excited particles, emission of infrared, visible and ultraviolet radiation, formation of ozone, low-frequency and high-frequency plasma pulsation, are manifested. Minimum heating of the implants during application of coatings, not exceeding 150ºC due to the possibility of high-speed movement of the plasma-chemical reactor or implants, is a distinctive feature of this process.
The deposited coatings are biocompatible, i.e. inert to biological objects and contributing to integration of the implants into body tissues.
The coatings being applied are multilayer (50-250 layers) with a nanometer range of monolayers (2-20 nm). Liquid precursors based on organometallic and inorganic liquids of SETOL family, the total annual consumption thereof during single-shift operation of the equipment is approximately 0.5 liters, are used to apply these coatings. These coatings are amorphous, due to the use of precursors that contain amorphizing elements, as well as due to high rates of their cooling in the course of deposition, equal to (1010–1012) K/sec. Due to the amorphous state of these coatings, they can be referred to bioglasses or glass-ceramic coatings.
Specific features of the process:
- enhanced antibacterial properties of the implant surface due to minimized parameters of roughness and possibility of introducing silver into the composition of the coating;
- eliminating any defects of the original surface of the implants, thereby reducing the probability of microorganisms’ accumulation in the hollows of the profile;
- ensuring higher durability of the threaded surfaces (screw, implant, and abutment) in the conditions of metal-to-metal contact and absence of any contact seizure;
- inertness of the “implant-coating” system to the corrosive-electrochemical effect of biofluids;
- improved biocompatibility due to application of coatings, which ensure a high level of implantation and effective osteointegration with strong anchoring of the implants in the bone tissue;
- less allergic reactions and toxicological effects on the body due to the barrier properties of the coating, which serve as a barrier to any release of ions of toxic elements from titanium alloys (vanadium and aluminum);
- use of implants with Pateks glass-ceramic coating (SiOCN system), additionally modified silver (BioPateks coating), helps to optimize the process of reparative osteogenesis due to antimicrobial and anti-inflammatory effects, as well as due to increased bone growth factor (osteostimulation).
Scope of application of coatings
Application of biocompatible coatings on the implant items used in traumatology, orthopedics of maxillofacial surgery and dentistry.
Examples of the works
- Ihde Dental implants (Switzerland) with BioPateks coating on the implants
- Application of BioPateks coating on the abutment screws
- Application of BioPateks coating on a clasp denture on claspers and crown
- Cannulated screws, threaded shafts, osteosynthesis plates with BioPateks coating
- Application of BioPateks coating on endoprosthesis
- Аpplication of chemically inert coatings
- Application of coatings of parts of gas analyzers
- Application of coatings of products and parts of analytical equipment
- Application of coatings on chromatographs
- Application of coatings on inner surface of tubes
- Application of coating similar to SilcoTec coating