Dental implants restorations basically include four parts: implant, abutment, metal framework, and crown. In this common kind of restoration, crown is cemented to metal framework. However, in this research a novel method of design of dental implant is presented which includes only two components: Integrated implant, and Crown. The new designed is based on an integrated implant which enables dentist to fit the crown by a snap-fit ring instantly. In order to carry out stress analysis, the finite element method (FEM) is applied on implant and bones to verify different loading conditions. The results of FEM are presented and proved to satisfy different loading conditions successfully. پرونده مقاله

: Investigating the mechanical behaviour of a healthy human ankle shows that it can be simulated by a mechanism composed of simple elements such as spring, and actuator. Hence, appropriate design of this mechanism can be resulted to an artificial ankle that can help amputees properly. Researches show that whatever the biomechanical behaviour of artificial ankle is similar to that of natural ankle, it can be used by consuming less energy. Considering biomechanical behaviour of normal ankle in a walking gait, required parameters for designing of an artificial ankle composed of springs and electromechanical actuator will be determined. Finally, to verify the suggested model, a prototype will be materialized and tested. پرونده مقاله