Effect of Different Surface Coating Applications on The Surface Roughness and Color Stability of Resin-Based Composites: An SEM Study

Objective: To investigate color change and surface roughness of resin-based composites treated with a surface coating agent. Methods: Forty specimens were prepared from each resin [G-ænial Posterior (microhybrid composite/GP) and SDR flow+(bulk-fill composite/SDR)]. Following baseline color and surface roughness (Ra) measurements, the specimens were randomly divided into 4 groups (n=10) according to surface coating agents [(Permaseal, Biscover LV, Prebond SE, and control group]. Following the application procedures, color and roughness measurements were repeated. The specimens were discolored for 144 hours in a coffee solution, renewing daily. Final measurements were performed. Color change values (?E00) and Ra were calculated. Surface topography was determined using scanning electron microscopy. Two-way analyses of variance, Tukey’s post-hoc test and Student t-test were performed, with a p<0.05 regarded as indicative of significance. Results: SDR showed more color change and surface roughness than GP and both materials presented unacceptable (AT>1.8) and perceptible (PT>0.8) discoloration. The highest discoloration was observed for Permaseal and Prebond SE in terms of ?E2 and ?E3. GP-Biscover LV, SDR-Prebond SE combinations showed the lowest and clinically acceptable (AT<1.8) ?E values. There were no significant differences between surface coating agents in terms of surface roughness (p>0.05). GP-Permaseal and SDR-Prebond SE combinations were exhibited less surface roughness. Conclusion: A bulk-fill composite is more prone to discoloration than a microhybrid composite. At each period, the bulk-fill composite exhibited greater surface roughness than the microhybrid composite. Biscover LV showed more acceptable results in terms of color stability and roughness than other surface coating agents (Permaseal and Prebond SE). © 2024, Ataturk Universitesi. All rights reserved.