Affiliation: | (1) Laboratory of Special Chemical Technology N.T.U. Athens, Greece;(2) Department of Prosthodontics, Division of Removable Prosthodontics, Faculty of Dentistry, University of Athens, Greece;(3) Present address: Department of Prosthodontics, Faculty of Dentistry, University of Athens, 2 Thivon Street, Goudi, 608 Athens, Greece |