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Erosive-abrasive effects on optical and surface properties of 3D printed resins with different surface finishing: An
Frederico Guilherme Otto Kokol1, Joissi Ferrari Zaniboni2, Francisco Fernando Massola Filho3
1MS Graduate, Department of Restorative Dentistry, Araraquara Dental School, São Paulo State University, Araraquara, São Paulo, Brazil.
Statement Of Problem:
The optical stability and surface roughness of 3-dimensionally (3D) printed dental resins under erosive-abrasive challenge remain critical to their clinical application, especially for esthetic restorations.
Purpose:
The purpose of this in vitro study was to evaluate the effect of an erosive-abrasive challenge on the optical properties, gloss, and surface roughness of 3D printed resins subjected to different surface finishing.
Material And Methods:
Three 3D printed resins: PriZma (PR), Vitality (VT), and Nanolab (NN) were subjected to 3 surface treatments (n=10): control - no treatment (CO), polishing (PO), or glaze application (G). Color change (ΔE₀₀), translucency parameter, contrast ratio, gloss, surface roughness, and surface morphology were assessed before and after erosive-abrasive challenge (citric acid exposure followed by 100000 cycles of simulated toothbrushing). ΔE₀₀ was analyzed using 1-way ANOVA and Tukey post hoc tests, and other data were analyzed using 2-way repeated-measures ANOVA and Bonferroni post hoc tests (α=.05).
Results:
A significant variation in ΔE₀₀ was found among the different groups (P<.001). VT-PO group showed an imperceptible change (ΔE₀₀<0.8). Translucency increased in the CO groups (P<.001) but remained stable in the PO and G groups, except for PR-PO. In contrast, significant reductions were observed in the CO groups (P=.001). Gloss was maintained or increased after the challenge in PR resin, except for PR-G, which preserved its initial values (P<.001). G and VT-PO groups exhibited ideal roughness values (Ra approximately 0.2 µm).
Conclusions:
Erosive-abrasive challenge significantly affected the optical and surface properties of 3D printed resins. Polishing and glazing improved property stability compared with untreated surfaces. Glazing was most effective for PriZma and Nanolab, while its effectiveness was reduced for Vitality.
