Avaliação da influência da escovação na superfície de resinas impressas 3D submetidas ao manchamento artificial

Abstract

Objective: The objective of this study was to evaluate the influence of toothbrushing on the surface of 3D-printed resins subjected to artificial staining by analyzing surface roughness and color change over time. For this purpose, forty-eight specimens (12×1 mm) were fabricated and divided into four groups (n=12) according to the resin type: PriZma BioCrown, ONX Tough 2, Varseosmile Crown Plus, and ONX Tough. After printing, cleaning, post-curing, and standardized polishing, the samples were subjected to coffee staining and simulated toothbrushing for periods equivalent to up to 5 clinical years (73.000 cycles). Color was measured using spectrophotometry (CIELAB system), and ΔE values were calculated. Surface roughness (Ra) was evaluated using a profilometer. Data were analyzed using repeated measures ANOVA and Tukey’s test (α=0.05). A significant increase in color change (ΔE) was observed over time (p<0.001), with more pronounced differences in the later periods. Surface roughness also showed significant variation (p=0.007), increasing in advanced time intervals. ONX Tough exhibited lower roughness values compared to the other resins, indicating better surface performance. Therefore, toothbrushing associated with artificial staining increased both surface roughness and color change of 3D-printed resins over time. Differences among materials indicate that composition directly influences clinical performance, with ONX Tough showing superior surface stability.