Fig. 2

Comparison of ΔGU values of material groups in immersion solutions according to polishing systems. A: Artificial saliva, B: Acidic beverage, C: Gastric acid. Mean ± standard deviation (Mean ± SD) of ΔGU values. (*p < 0.05 indicate statistical differences between groups.) (FC: Feldspathic ceramic, LDC: Lithium disilicate glass ceramics, RNC: Nano-ceramic resin, GU: Gloss unit).