1. THE EFFECT OF A NATURAL EXTRACT-BASED EXPERIMENTAL BLEACHING GEL UPON THE COLOUR AND SURFACE ROUGHNESS OF A COMPOSITE RESIN - AN IN VITRO STUDY. Authors: RADU SEPTIMIU CAMPIAN, DIANA DUDEA, DANIELA CORNEA, ALEXANDRA IULIA IRIMIE, CRISTINA STEFANA MIRON-BORZAN, MARIOARA MOLDOVAN, CRISTINA GASPARIK, DIANA CARLA MADA.