Biomedical subjects
Publications and source records attributed to G N Chechina.
The strength and color stability of various composites of photo- and chemical consolidation is assessed by laboratory methods. The class of a material is the most essential factor affecting the above characteristics. The macrofilled and hybrid materials showed the best adhesive and bending strength. The method of consolidation does not notably affect the studied characteristics.
A new in principle, ecologically safe and low-waste technology for preparation of an alloy and a formula of several silver alloys containing different levels of silver (OCTA-43, 70 and 80) have been developed. The absence of a alpha-2 phase in amalgams prepared from these alloys is their principally new feature. Physical properties of the new alloys were studied and compared with the known Russian and foreign analogs. Amalgam prepared from CCTA-43 alloy is characterized by optimal characteristics. By their physical characteristics the new compositions are superior to traditional and silver alloys manufactured in Russia at present, and amalgam prepared from OCTA-43 alloy is not inferior to the best foreign analogs.
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Rapid methods for determining the hemolytic activity in 10% suspension of human red cells and the cytotoxicity in human embryo fibroblast and HeLa cell cultures were used to assess the biological characteristics of some experimental composite filling materials and their foreign analogs. The results permit assessing the impact on the biological characteristics of individual components, of the entire composition, of the purity of the initial ingredients and their polymerization ability, this being valuable for the development of materials with the optimal characteristics.
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To assess the working conditions of medical staff the authors compared mercury vapor concentrations released during manipulations with various copper amalgams, TMAC-01 tableted copper amalgam manufactured by Nikitiv Mercury Plant, its foreign copper analog manufactured be "Becht" (Germany), and a new CMTA capsulated copper amalgam. Use of CMTA copper amalgam was found not hazardous for medical staff provided sanitary and hygienic regulations were adhered to. Moreover, mercury vapor concentrations released during work allow its use in rooms without ventilation cabinets, whereas tableted copper amalgams TMAC-01 and Becht may be used only in dentistry rooms equipped with such cabinets.