Color Stability and Gloss of Esthetic Restorative Materials after Chemical Challenges

Abstract

This study evaluated gloss and color changes of esthetic restorative materials subjected to different acidic beverages. Specimens of resin composites (Z350XT (Z350), IPS Empress Direct (ED), Charisma Diamond (CD)) were prepared and the initial surface gloss and color (ΔE) were measured (n=10). Then, the specimens were immersed in 4 mL of each of the different beverages (cranberry juice; Coca-Cola; coffee or artificial saliva) during 15 min, 3x/day for 14 days and new gloss and color readings were obtained. Color change was evaluated with the ΔE formula and gloss change values were obtained by the formula: (final gloss - initial gloss). Data was submitted to two-way ANOVA followed by Tukey’s post hoc test (a=0.05). CD showed the lowest color change among resin composites. The highest ΔE values were obtained after immersion in coffee and cranberry juice. Coffee promoted the highest gloss change (worst gloss retention), followed by cranberry juice, Coca-cola and artificial saliva (p<0.05). The type of beverage significantly influenced the gloss of resin composites. Coca-cola reduced gloss of the three resin composites in a similar manner. Coffee affected the ED gloss more than that of Z350 and CD, while cranberry juice affected Z350 more than ED and CD. Saliva had a more pronounced effect on the gloss retention of CD than ED. The beverages used in this study influenced the optical surface properties of the composites studied.

Oxygen Inhibition of Surface Composites and Its Correlation with Degree of Conversion and Color Stability

“…This in vitro investigation was conducted using a 3x4x2 factorial study design to evaluate the factors "composite resin -bulk-fill, conventional nanoparticle and microhybrid", "protocols of surface treatments-no treatment, oxygen inhibition with glycerin, finishing and polishing, and glycerin + finishing and polishing" and "assessment time -immediate and mediate analysis". The main response variables included in this study were [1] degree of conversion and [2] color change.…”

“…Composite resins are materials widely used in daily practice that need adequate polymerization for good clinical performance (1). These materials are undergoing chemical degradation processes in the oral cavity due to diets that contain staining solutions, as well as acidic foods and drinks (2,3). Degradation of composite resin, including color alteration, may result in additional costs due to early replacement of restorations.…”

Pit and fissure nanocomposite sealants reinforced with organically modified montmorillonite: A study of their mechanical properties, surface roughness and color stability

“…The importance of color stability in dental restorative materials due to esthetic reasons is reflected by many studies dedicated to the evaluation of color changes caused by discoloration factors, polishing and bleaching treatments etc [49][50][51][52] . Several reports regarding restorative materials claim that color alteration is perceptible when ΔE>1, clinical acceptable values are limited to ΔE<3.3 [53][54][55] .…”

<p>Color stability of Lucirin-photo-activated resin composite after immersion in different staining solutions: a spectrophotometric study</p>

“…In the oral cavity, a composite restoration is subjected to intrinsic and extrinsic staining. [18][19][20][21] Staining can be related to polymerization depth, filler particles size, photo-initiator, and the resin matrix. [22][23][24][25][26][27] Change in temperature, water sorption or adsorption, food, drinks, smoking as well as oral hygiene are some of the oral environment contributing factors.…”

“…[22][23][24][25][26][27] Change in temperature, water sorption or adsorption, food, drinks, smoking as well as oral hygiene are some of the oral environment contributing factors. 20,22,28,29 Extrinsic staining can be managed by maintaining polished composite surface initially and later through periodic repolishing. [30][31][32][33][34] Resin-based composite materials represent the most commonly used restorative material in aesthetic restorations.…”