The objective of the present work is to analyse the solidification process of NiTi binary alloy. The physical medium is taken as an incompressible fluid with variable (i.e. temperature dependent) physical properties where the heat is transferred by conduction and convection, including the thermal phase change phenomenon. The last one is modelled by the improvement procedure called enthalpy-porosity formulation, where the liquid-solid mushy zone is treated as a porous zone with porosity equal to the liquid fraction. The numerical model is based on the finite volume method in body fitted coordinates with a SIMPLER scheme to couple the pressure and velocity fields. The results are presented for the velocity and temperature field, as well as for the NiTi mass fraction during the solidification process.
COBISS.SI-ID: 18864150
We present a case series of 6 hips in 6 patients who underwent revision of total hip arthroplasty as a result of modular femoral neck fracture of otherwise stable total hip arthroplasty (THA). The study group consisted of 6 men with an average age of 49.5 (37-56 years). All patients presented with acute-onset pain at a mean of 5.6 (2.3-12 years) after the index procedure, following an uneventful and asymptomatic initial recovery period. The pain was localized to the groin, the patients were unable to tolerate weight bearing, the involved leg was shortened, the hip was in external rotation, and emergency room radiographs revealed a fractured modular femoral neck.
COBISS.SI-ID: 5345599
The aim of this study was to investigate pain perception in patients with dental crowding after insertion of six different NiTi orthodontic archwires as a part of fixed appliances in the first stage of orthodontic treatment.
COBISS.SI-ID: 18610710