Colonization of polymeric dental prosthetic materials by yeast-like fungi and the association of these microorganisms with complications occurring during prosthetic treatment are important clinical problems. In previously presented research, submicron inorganic particles of silver sodium hydrogen zirconium phosphate (S-P) were introduced into poly(methyl methacrylate) (PMMA) denture base material which allowed for obtaining the antimicrobial effect during a 90 day experiment. The aim of the present study was to investigate the flexural strength, impact strength, hardness, wear resistance, sorption, and solubility during three months of storage in distilled water. With increasing S-P concentration after 2 days of conditioning in distilled water, reduced values of flexural strength (107-72 MPa), impact strength (18.4-5.5 MPa) as well as enhanced solubility (0.95-1.49 µg/mm 3 ) were registered, but they were at acceptable levels, and the sorption was stable. Favorable changes included increased hardness , flexural modulus (2.9-3.3 GPa), and decreased volume loss during wear test (2.9-0.2 mm 3 ). The percentage changes of the analyzed properties during the 90 days of storage in distilled water were similar for all materials.

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BACKGROUND: Zirconia is a commonly used ceramic for fixed full-ceramic restorations. Porcelain-fused-to-metal restorations applied for bruxers are often very quickly destroyed by this group of patients. OBJECTIVE: The aim of this study was to investigate the influence of accelerated aging tests on BruxZir HT 2.0 zirconia. METHODS: Zirconia samples were prepared with ISO 13356:2013 and ISO 14704:2008 protocol recommendations. The ageing conditions were times of 2.5, 5 and 10 hours, and pressure of 0.2 MPa and a temperature of 134°C. RESULTS: The correlation between ageing time and mechanical properties, particularly hardness, was difficult to find, while correlations between hardness and the surface topography and fracturing were clear. CONCLUSION: On the basis of the conducted research, it can be stated that BruxZir HT 2.0 zirconia meets the technical requirements for medical grade zirconia used in dental technology. Future investigations should include phase composition research.

The aim of this study was to assess the suitability of the atomic layer deposition method in terms of using it for 316 LVM (low carbon vacuum melt) steel surface modification that is used for blood‐contacting implants in determined technological conditions. As part of a suitability assessment of thin layer deposition technology, the performance of mechanical and physical properties testing was proposed. The investigation influences the evaluation of the analysed material in the cardiovascular system's behavior used for blood. 316 LVM stainless steel was the initial material to be tested. The 316 LVM steel was subjected to the following surface modifications: electrolytic polishing, chemical passivation and deposition of a silicon dioxide (SiO2) layer using the atomic layer deposition method. The layer was applied at a variable thickness depending on the atomic layer deposition process, at constant temperature. In terms of mechanical properties, the analyzing adhesion of applied layers to the metallic base and its hardness were examined. What is more, during the evaluation of physical properties, testing of surface wettability was performed, which has a fundamental significance in case of implants used in the cardiovascular system. The obtained results have direct impact on optimization process of SiO2 layers deposition with atomic layer deposition method on blood‐contacting implants, which surface was made of steel 316 LVM, there by resulting in their have a direct impact functional properties improvement.