Influence of repeating bleaching procedure on surface roughness of porcelains - ERDEM, KÜBRA; ERDEM, KÜBRA; ÖZYILMAZ, ÖZGÜN YUSUF; SAYIN ÖZEL, GÜLSÜM; TAHA, MUHAMMED ESAD; ÖZYILMAZ, ÖZGÜN YUSUF (My University, 2019)