1. Physical Metallurgy Laboratory, Mechanical Engineering Department, Aristoteles University of Thessaloniki, Thessaloniki, Greece
2. Department of Fixed Prosthesis and Implant Prosthodontics, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Laboratory for Special Engineering, Department of Electrical and Computer Engineering, Polytechnics School, Democritus University of Thrace, Komotini, Greece