earticle

영어

Purpose: To evaluate how alumina sandblasting (AL), with and without hydrofluoric (HF) acid etching, affects surface roughness and optical properties (ΔE00 and TP) used for laminate veneers. Methods: Thirty A2-shade nano-hybrid ceramic specimens were milled and finished to a thickness of 0.5±0.01 mm and allocated to three groups (n=10): AL, AL+5% HF (AL5), and AL+9.5% HF (AL9.5). Surface roughness (Ra) and optical properties (ΔE00, TP) were evaluated. Data normality and homoscedasticity were assessed, followed by Welch’s analysis of variance (ANOVA) with Dunnett T3 (Ra) and ANOVA with Tukey HSD (ΔE00, TP) at α=0.05. Field-emission scanning electron microscope/energy dispersive X-ray spectroscopy characterized surface and microstructural changes. Results: Mean±SD were as follows. Ra (μm): AL 2.86±0.54, AL5 2.43±0.26, and AL9.5 2.79±0.15 (p<0.05); ΔE00: AL 2.94±0.90, AL5 7.79±0.70, and AL9.5 8.81±0.64 (p<0.001); and TP: AL 28.40±1.00, AL5 23.62±0.86, and AL9.5 22.69±0.72 (p<0.001). Post-hoc analysis revealed that Ra differed only between AL5 and AL9.5. ΔE00 differed among all groups. For TP, differences were present for AL versus AL5 and AL9.5, but not between AL5 and AL9.5. Conclusion: At a veneer thickness of 0.5 mm, the addition of HF etching to AL significantly increases color change and reduces translucency, whereas roughness differences are modest and group-dependent. Increasing HF concentrations induce micro-porosity and silica dissolution that likely drive optical shifts.