Co-Cr alloys have good mechanical properties such as high hardness, excellent magnetic properties and good corrosion resistance. For this reason, they are most commonly used as dental and orthopaedic implants. Generally, cast Co-Cr-Mo alloys and forged Co-Ni-Cr-Mo alloys are used for the production of implants. In this study, we investigated two dental alloys, namely, Co-Cr-Mo and Co-Cr-W-Mo alloys. The aim of this study was to determine the effect of heat treatment on the development of the microstructure and to evaluate its influence on the alloys’ mechanical and tribological properties. The samples were first solution-annealed at 1200 °C in an argon atmosphere for 2 h, then quenched in water and subsequently aged at 900 °C in an argon atmosphere for 1, 3 and 12 h. A microstructural analysis was performed using SEM, with EDS for microchemical analysis and EBSD for phase identification. In addition, the Vickers hardness and wear resistance of the two alloys were analysed before and after heat treatment. The Co-Cr-Mo alloy showed better wear resistance and also a generally higher hardness than the Co-Cr-W-Mo alloy. Both alloys showed signs of abrasive and adhesive wear, with carbide particles detaching from the Co-Cr-W-Mo alloy due to the lower hardness of the matrix. The Co-Cr-Mo alloy showed the best abrasion resistance after the longest aging time (12 h), while the Co-Cr-W-Mo alloy showed the best as-cast abrasion resistance. With ageing, the wear resistance of both alloys increased.

Izhodišče: Pri osebah s kronično razširjeno bolečino je pogosto prisotna depresivna simptomatika, ki lahko še dodatno poslabša kakovost njihovega življenja. Namen raziskave je bil preučiti strah pred gibanjem, pripravljenost na doživljanje bolečine in vključenost v dejavnosti glede na prisotnost depresivne simptomatike.Metode: V raziskavo je bilo vključenih 215 oseb, ki so bile med oktobrom 2016 in aprilom 2018 pregledane v ambulanti za rehabilitacijo oseb s kronično nerakavo bolečino na URI – Soča. V okviru pregleda so reševale Beckov vprašalnik depresivnosti (BDI-II), Lestvico strahu pred gibanjem Tampa (TSK) in Vprašalnik sprejemanja kronične bolečine (CPAQ).Rezultati: Multivariatna analiza variance je pokazala, da se osebe s kronično bolečino in depresivno simptomatiko razlikujejo od tistih brez depresije v strahu pred gibanjem, v pripravljenosti na doživljanje bolečine in vključenosti v dejavnosti. Pri depresivnih osebah je bil strah pred gibanjem večji, pripravljenost na doživljanje bolečine in vključenost v dejavnosti pa manjša kot pri osebah brez depresije. Zaključek: Zaradi pogostosti depresivne simptomatike pri osebah s kronično bolečino ter njenim vplivom na več področij delovanja je ustrezna obravnava razpoloženjskih težav ključnega pomena.