The Editors Radi Masri, BDS, MS, PhD, is a Wilson-Elkins Professor at the University of Maryland Baltimore in Baltimore, Maryland, USA. He lectures nationally and internationally and serves as an external examiner for international dental schools in the field of prosthodontics. Carl F. Driscoll, DMD, is a Professor at the University of Maryland Baltimore in Baltimore, Maryland, USA. He is a world renowned educator, lecturer, and prosthodontist. He has published extensively and contributed significantly to organized dentistry