Highly wear-resistant and biocompatible carbon nanocomposite coatings for dental implants

Diamond-like carbon coatings are increasingly used as wear-protective coatings for dental implants, artificial joints, etc. Despite their advantages, they may have several weak points such as high internal stress, poor adhesive properties or high sensitivity to ambient conditions. These weak points could be overcome in the case of a new carbon nanocomposite coating (CNC) deposited by using a C60 ion beam on a Co/Cr alloy. The structure of the coatings was investigated by Raman and XPS spectroscopy. The wear resistance was assessed by using a reciprocating tribotester under the loads up to 0.4 N in both dry and wet sliding conditions. Biocompatibility of the dental implants was tested in vivo on rabbits. Biocompatibility, bioactivity and mechanical durability of the CNC deposited on a Co/Cr alloy were investigated and compared with those of bulk Co/Cr and Ti alloys. The wear resistance of the CNC was found to be 250e650 fold higher compared to the Co/Cr and Ti alloys. Also, the CNC demonstrated much better biological properties with respect to formation of new tissues and absence of negative morphological parameters such as necrosis and demineralization. Development of the CNC is expected to aid in significant improvement of lifetime and quality of implants for dental applications

Organ-saving and Reconstructive Plastic Surgery of Breast Cancer

Surgical treatment of breast cancer is an integral part of complex treatment. In recent years, the goal of treatment is not only to ensure long-term relapse-free and metastatic survival, but also a proper quality of life, which requires new approaches to surgery.The aim of the literature review was to analyze current trends in the development of methods of surgical treatment of the breast cancer and ways to improve immediate and late results.The results of the analysis and discussion. Until recently, radical mastectomy was performed to treat breast cancer, which causes long-term lymphovenous complications and significantly impairs the quality of life of patients. In recent decades, there has been a development of breast cancer surgery in the direction of the introduction of organ-saving and reconstructive plastic surgery with the improvement of technology for their implementation. There is no generally accepted concept of the optimal method of surgical treatment, both in terms of the volume of the operation and the choice of the method of reconstruction.Conclusions. The problem of choosing the optimal method of surgical treatment of breast cancer, which should provide oncological radicalism and at the same time a good cosmetic result remains unresolved and requires further researc