Influence of Mechanical and Chemical Degradation in the Surface Roughness, Gloss, and Color of Microhybrid Composites

Abstract

Aim:The aim of this study was to investigate the association of different degradations on the roughness, gloss, and color changes of microhybrid composites. Materials and methods:Ten specimens were prepared for Charisma, Amelogen Plus, Point 4, and Opallis resins. Surfaces were polished and baseline measurements of roughness, gloss, and color were recorded. Specimens were then submitted to chemical and mechanical challenges, and the specimens were reevaluated. Roughness and gloss were analyzed by KruskalWallis and Dunn's test (p < 0.05). Color change (ΔE) was analyzed by one-way analysis of variance and Tukey's tests (p < 0.05). The initial and final data were compared using the Wilcoxon test (p < 0.05). Spearman test checked the correlation between the roughness and gloss (p < 0.05). Results:Regarding surface roughness and gloss, there was no difference between composites before challenges. However, all composites showed a significant increase of roughness after challenges, with highest values for Charisma. The gloss was influenced by challenges, evidencing the best gloss for Point 4. Charisma showed the highest value of color change. There was no correlation between surface roughness and gloss for the initial analysis, and after the challenges. Conclusion:Composites were influenced by association of challenges, and Charisma showed the highest changes for roughness, gloss, and color. gloss, and color change. The dentist should be aware of the performance of different brands, to choose the correct required composite resin for each type of patient or region to be restored.

Characterization of low-cost Brazilian resin composites submitted to tooth brushing

“…23,31 Nevertheless, composite gloss may be further influenced by the difference in the refractive indexes of the organic matrix and particles. 45 Filtek Z250 XT has high filler content by weight (82%). This feature, added to its filler particularities-nano-zirconia/ silica spheroidal particles-may have influenced its gloss.…”

Effect of wetting agent coverage on the surface properties of resin composite submitted to brushing and staining cycles

“…black glass ( 26 ). Its values may be resulted from interactions of several factors, such as the material composition, its degree of conversion, type and size of load particles, as well as differences of refractive indexes of organic matrix and particles ( 19 , 27 ). Modeling Resin is a low viscosity microfilled resin, composed by 30% by weight of amorphous silica.…”

Effect of Different Finishing and Polishing Techniques on Surface Roughness of Two Universal Nanohybrid Composite Resins

“…Esthetic restoration can be imperceptible only if its surface closely resembles enamel surface [14]. Proper finishing of restorations is desirable not only for esthetic considerations but also for oral health.…”

“…A literature review has pointed out that the surface roughness (Ra) of restorations should not be more than 0.2 µm to avoid an increase in bacterial adhesion to the restorative materials [16]. The effectiveness of finishing/ polishing procedures on the composite surface is an important goal to be achieved in the restorative process [14]. Two factors affect the quality of polishing: The material used for restoration and the finishing and polishing procedures adopted [17].…”