Surface roughness, gloss and color change of different composites after exposure to ultimate challenges

Abstract

Aim: The study aimed to investigate the effect of the association of chemical and mechanical degradation on the surface roughness, gloss and color of nano and microfilled composites. Method: Disc-shaped specimens (n=10) were prepared for three nanocomposites (Filtek Z350XT, IPS Empress Direct, Charisma Diamond) and three microfilled composites (Estelite Σ Quick, Durafill VS, Renamel). After polishing, baseline surface roughness, gloss and color measurements were obtained. Specimens were submitted subsequently to the following challenges: chemical for 1 week (Hydrochloric acid, Coca-Cola and Red Wine) and mechanical (Toothbrushing). Surface roughness and gloss data were analyzed by Kruskal-Wallis followed by Dunn’s test. Color difference (ΔE) was analyzed by one-way ANOVA and Tukey test. Results: The initial data were compared with those after challenges using the Wilcoxon test (p<0.05). All composites showed a significant increase (p<0.05) of surface roughness, after overstress. Filtek Z350 XT and Renamel had the lowest final surface roughness values and roughness increase (p<0.05). The comparative analysis revealed that Estelite Σ Quick and Renamel did not significantly change the gloss after challenges (p=0.185). Filtek Z350 XT and IPS Empress Direct had higher color variations, after the challenges than the other resins (p<0.05). Conclusion: Chemical and mechanical challenges influence on characteristics of all composites, except for gloss on Estelite Σ Quick and Renamel composites.

The Effect of Chemical Degradation and Polishing on the Gloss of Composite Dental Materials

“…Such influence of Coca-Cola is thought to be due to the presence of acids, and the highest phosphoric acid contained in the composition of this drink affects the low pH = 2.5 [ 19 ]. There is also the influence of phosphoric acid on the organic matrix, which softens and thus leads to a change in light refraction and consequently a decrease in gloss [ 20 , 21 ].…”

Effect of novel whitening toothpastes on the surface roughness, microhardness, and color stability of anterior Extra Bleach White (XBW) composite: an in-vitro study

“…Surface roughness, micro hardness and color stability are significant features responsible for the durability of composite resin restorations. Restorative materials with high surface roughness and low micro hardness are susceptible for indentations and scratches which may leads to color instability and total failure of the restorations 12,13 . Bleach shade composites are luminous and more translucent than ordinary shades, they have lower translucency and higher masking ability.…”