Color Stability and Polymerization Behavior of Direct Esthetic Restorations

Oliveira, Dayane Carvalho Ramos Salles de; Souza-Junior, Eduardo José; Prieto, Lúcia Trazzi; Coppini, Erick Kamiya; Maia, Rodrigo Rocha; Paulillo, Luís Alexandre Maffei Sartini

doi:10.1111/jerd.12113

Cited by 32 publications

(34 citation statements)

References 31 publications

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“…Absorption of visible light is increased, so the material becomes yellow (SCHNEIDER et al, 2009). Even if the concentrations of unreacted amine for each composite was not measured, it is predicted that the increased yellowing with nanofilled composites occurred because of the lower conversion degree (OLIVEIRA et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Effects of artificial accelerated aging on the optical properties of resin composites

Dantas¹,

Mathias²,

Borges³

et al. 2018

Biosci. J.

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ABSTRACT:The aim of this study was to evaluate the effects of ultraviolet artificial aging on color, fluorescence, gloss, and translucency of different composite resins. Seventy-five cylindrical-shaped specimens (6 mm in diameter and 1 mm thick) of four different composites: Admira Fusion (VOCO), TPH3 (DENTSPLY), GrandioSO (VOCO) and Filtek™ Z350 XT (3M/ESPE), were built. Enamel samples obtained from bovine incisors were prepared with the same dimensions and used as a control group. Assessments of color, translucency, fluorescence, and gloss were performed at baseline and after artificial aging. Specimens were immersed in artificial saliva and submitted to artificial aging (UV light for 300h). Data were analyzed using one-way ANOVA and Tukey's post hoc test (α=0.05). After aging, all resin composites presented significant alterations, mainly Filtek™ Z350 XT. Fluorescence decreased in all resin composites and enamel. Gloss was reduced in all groups, too, with major rates for TPH3 and GrandioSO, which was similar to the enamel reduction. Translucency did not present a significant difference for the resin composites, although there was a reduction in the enamel. After artificial aging resin composites became darker, less fluorescent, less glossy, and with no alteration in translucency.

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Section: Discussionmentioning

confidence: 99%

Effects of artificial accelerated aging on the optical properties of resin composites

Dantas¹,

Mathias²,

Borges³

et al. 2018

Biosci. J.

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“…Several studies have been conducted to address the influence of exogenous factors such as dyes from food and beverages and weathering conditions on the color stability of resin-based materials [3,9,14,22]. However, little is known about the variables influencing the intrinsic color change occurring after the light-activation [21].…”

Section: Introductionmentioning

confidence: 99%

Color changes induced by light curing of resin composites

Mondelli

Tavares

Medina-Valdivia

et al. 2017

RSBO

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Introduction: Color changes that occur after the light-activation of resin composites should be understood. Objective: To evaluated the influence of light-curing devices on the color of resin composites immediately after light-activation and after one-week, at 37ºC, into water storage. Material and methods: Three A2-shade composites (Z100, Z250, and Z350), and four light-curing devices (three halogens and one LED) were evaluated. Seventy-five cylindrical specimens were light-activated for 20s. CIE-Lab color was analyzed using a spectrophotometer. Color changes between uncured and immediately light-activated materials (∆E 1 ), and between immediately light-activated and one-week-37˚C-water-stored materials (∆E 2 ) were obtained. Data were evaluated by two-way Anova, followed by Tukey test (α = 0.05). Results: For ∆E 1 , composites (p = 0.0008), lights (p = 0.015), and the interaction (p = 0.017) were significant. Z100 showed the smallest value (3.08 ± 1.73). The halogen 210 mW/cm 2 device showed the smallest ∆E 1 (3.09 ± 1.25), while the LED 200mW/cm 2 showed the highest value (4.94 ± 2.37). For ∆E 2 , composites (p = 0.00016), lights (p < 0.0001), and the interaction effect (p = 0.0002) were significant. Z350 showed the smallest value (2.24 ± 1.17). The halogen 400mW/cm 2 device showed the smallest ∆E 2 (2.15 ± 2.15), while the halogen device 525mW/cm

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“…The sensitivity of the human eye to detect color variation translates to ΔE> 3.3; thus, the color changes were imperceptible to human sensitivity 22,28,29 . However, analysis of the CIELAB color scale coordinates (L *, a *, and b *) showed significant changes in the values of L*.…”

Section: Discussionmentioning

confidence: 99%

“…After the mechanical degradation, there were increases in the lightness for all materials studied, probably the optical changes that occurred reflect physical and chemical reactions: i) internal -such as hydrolysis -or ii) in the surface -such as increased roughness -, as these affect the lightness through changes in the refractive index and reflection, respectively 28 , since the specimens were not exposed to any coloring agent and there was standardization of the thickness of the specimens.…”

Section: Discussionmentioning

confidence: 99%

Biological and mechanical degradation affecting the surface properties of aesthetic restorative

et al. 2017

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Aim: To evaluate the roughness (Ra), Knoop hardness (KHN) and change of color (∆E) of esthetic restorative materials (Filtek Z350-composite nanoparticle; Empress Direct-composite nanohybrid and IPS e.Max-ceramic) subjected to contact with the Streptococcus mutans biofilm (biological degradation) associated with abrasion generated by tooth brushing (mechanical degradation). Methods: Ten specimens of each material were prepared, and the surface properties initial were evaluated. All specimens were exposed to Streptococcus mutans inoculum; after 7 days, surface properties were evaluated. The specimens were submitted to a 30,000 toothbrushing cycles, using a toothpaste slurry, then, surface properties were evaluated again. Data were analyzed by Proc-Mixed, One-way ANOVA, Tukey-Kramer and Tukey's tests (α = 0.05). Results: At the baseline, ceramic showed the highest Ra and KHN values; after the biological degradation the composites showed increased Ra, but KHN did not change; after the mechanical degradation, Empress showed decreased Ra and Z350 showed similar Ra, the KHN increased to both composites, and all materials had increased lightness after the mechanical degradation. Conclusions: The results suggest that, when exposed to Streptococcus mutans biofilm and toothbrush abrasion, the ceramics undergoes minimal degradation and the composites exhibited variable degradation, depending on the composition of the material.

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Color Stability and Polymerization Behavior of Direct Esthetic Restorations

Cited by 32 publications

References 31 publications

Effects of artificial accelerated aging on the optical properties of resin composites

Effects of artificial accelerated aging on the optical properties of resin composites

Color changes induced by light curing of resin composites

Biological and mechanical degradation affecting the surface properties of aesthetic restorative

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