Empress and Cergo Crownsadmin2016-12-06T06:56:36+00:00 Empress and Cergo Crowns These are all ceramic crowns made in Leucite reinforced ceramics. These are very esthetic and translucent and more economical than the Procera crowns. However have to be limited to the 2nd premolar region. Empress and Cergo Crowns Before After