OBJECTIVES: The objective of this study was to observe and to measure the impact of corundum sandblasting on the thickness of the Immediate dentin sealing layer. METHODS: 20 recently extracted molars were collected and divided randomly into two groups. A standardized preparation was performed on each tooth and the Optibond FL dentin bonding agent (Kerr, Orange, USA) was applied on the prepared surface according to the manufacturer 's instructions. The surface was then partially sandblasted. RONDOfl ex plus 360 (KaVo, Bieberach an der Riss, Germany) and Airsonic Mini-Sandblaster (Hager&Werken, Duisburg, Germany) were used. Microscope observations were made. RESULTS: The arithmetic mean of the Optibond FL dentin bonding agent fi lm thickness was 48.72 μm (Group 1=45.55 μm and Group 2 = 51.88 μm). The dentin bonding agent layer thickness was reduced to the average value of 17,12 μm by RONDOfl ex plus 360 sandblasting (Group 1). The zero value was recorded in 16 % of the locations. The Airsonic Mini-Sandblaster sandblasting changed the average thickness of the dentin bonding agent layer to 13.25 μm with 31 % of zero values (Group 2). CONCLUSION: The results of this research lead to a refl ection on modifi cations of the immediate dentin sealing procedure (Tab. 4, Fig. 3, Ref. 28).

In this article are proposed and investigated the baromembrane methods for purification of potato juice with recycling. The resulting concentrate could be used as a feed and food additive. The optimal technological parameters of the ultrafiltration stage – the type of membranes, the molecular weight cutoff, the process temperature, and the operating pressure are analyzed and determined.

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In this work, a TiNiTa wire with a tantalum content of 10% (weight) was obtained, heat treatment of wire samples was carried out at various temperatures in a vacuum furnace, mechanical tests were carried out after heat treatment to determine the optimal heat treatment mode after the final drawing step to remove hardening and obtain the best complex mechanical properties for the use of wire in the manufacture of medical stents.

This work is devoted to the study of the hardness of various compositions of TiNbTa alloys for medical applications in the hip joints. This TiNbTa alloy system has a shape memory effect and superelasticity. The paper describes the technology for producing plates 1 mm thick of TiNbTa alloys. Carrying out thermal and mechanical treatments of these alloys. The effect of Nb doping on the structure and hardness of TiNbTa alloys is shown.