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The aim of this study was to investigate whether boron nitride (BN) and BN-chromium (BN-Cr) coatings applied with the sputtering method would change the characteristics of hardness and discoloration of the ceramic veneer surface. In this experimental study, thirty disc-shaped cores (10 mm in diameter and 0.8 mm in thickness) were prepared. Three different ceramic systems, IPS Empress (E) (Ivoclar Vivadent, Schaan, Liechntenstein), IPS e.max Press (EP) (Ivoclar Vivadent, Schaan, Liechntenstein), and Turkom Cera (T) (Turcom-Ceramic SDN-BH
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