Color stability of composites subjected to accelerated aging after curing using either a halogen or a light emitting diode source

Pires‐de‐Souza, Fernanda de Carvalho Panzeri; Garcia, Lucas da Fonseca Roberti; Hamida, Hisham Mohamad; Casemiro, Luciana Assirati

doi:10.1590/s0103-64402007000200006

Cited by 60 publications

(79 citation statements)

References 18 publications

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“…Additionally, the incomplete polymerization has a considerable influence on the color stability [13,15], since no resin-based material can achieve 100% of final curing [23]. The discoloration is commonly attributed to the degeneration of the chemical union between filler particles and resin matrix, and to the solubility of the resin matrix itself and the photo-initiator system [8,24].…”

Section: Introductionmentioning

confidence: 99%

“…The effect iveness of polymerization depends not only on the chemical composition of the restorative material or the particle size and type, but also on the light-curing devices, including the light spectrum, exposure time and irradiance [24]. It has been observed that resin composites with increased degree of conversion have better mechanical properties, better wear resistance and improved color stability [7,15].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Th e specimens were placed in a two-piece stainless steel matrix with height adjustment, 14 which prevented any contact of the fi nishing and polishing instruments with the matrix surface. Th ese procedures were performed perpendicular to the bipartition marking, 13 with a standardized pressure of 2 kg.…”

Section: Methodsmentioning

confidence: 99%

“…With regard to the infl uence of extrinsic factors on color stability, factors related to patient behavior, such as poor oral hygiene and diet based on foods and beverages containing pigments; and those related to the dentist such as fi nishing and polishing procedures are highlighted 10,13,15,17 .…”

Section: Introductionmentioning

confidence: 99%

Effect of finishing and polishing on color stability of a nanofilled resin immersed in different media

Oliveira

Lorenzetti

Garcia

et al. 2014

Rev. odontol. UNESP

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ResumoObjetivo: O objetivo deste estudo foi avaliar o efeito do acabamento e polimento na estabilidade de cor da resina nanoparticulada Filtek Z350 XT em função de diferentes meios de imersão. Material e método: Espécimes circulares (10 mm de diâmetro e 2 mm de espessura) foram preparados para cada grupo (n=6) utilizando uma matriz de aço inoxidável. Os grupos experimentais foram divididos de acordo com a presença ou ausência de acabamento e polimento e diferentes meios de imersão (saliva artificial, Suco artificial pronto KAPO  da Coca-Cola  sabores: abacaxi, laranja, morango e uva). Os procedimentos de acabamento e polimento foram realizados com discos de lixa Super-Snap  . Os espécimes permaneceram em saliva artificial por 24 horas (baseline) e foram submetidos à análise da cor usando um espectrofotômetro pelo sistema CIELab. Em seguida, foram imersos nos diferentes meios por 5 minutos, 3 vezes ao dia, com intervalos de 4 horas, durante 60 dias. Os espécimes foram mantidos em saliva artificial a 37±1°C nos intervalos entre as imersões. Após este período foi realizada nova leitura de cor. Os dados foram analisados com os testes de Kruskall-Wallis e Mann-Whitney. O nível de significância foi de 5%. Resultado: Os resultados mostraram que o acabamento/polimento não influenciou significativamente a estabilidade de cor da resina composta (p>0,05). Não houve diferença estatisticamente significativa na estabilidade de cor da resina estudada após a imersão nos diferentes meios (p>0,05). Conclusão: O acabamento e polimento e os meios de imersão não apresentaram influência na estabilidade de cor da resina nanoparticulada Filtek Z350 XT.Descritores: Resinas compostas; cor; polimento dental. AbstractObjective: The purpose of this study was to evaluate the effect of finishing and polishing on color stability of a nanofilled composite resin (Filtek Z350 XT) according to different immersion media. Material and method: Composite disks (10 mm diameter, 2 mm thickness) were prepared for each group (n = 6) using a stainless steel mold. The groups were divided according to the presence or absence of finishing and polishing procedure and immersion media (artificial saliva, artificial juice-KAPO  Coca-Cola  flavors: pineapple, orange, strawberry and grape). The finishing and polishing procedures were performed using Super -Snap  disks. The specimens were stored in artificial saliva for 24 hours (baseline) and were analyzed using a color spectrophotometer by CIELab system. Then, they were immersed in different media for 5 minutes, 3 times a day, every 4 hours during 60 days. They were stored in artificial saliva at 37 ± 1°C during the immersion intervals. After this time, new measure of color was performed. The data were analyzed using Kruskall-Wallis test and Mann-Whitney test. The significance level was 5%. Result: The results showed that the finishing/polishing not significantly influence the color stability of resin composite (p > 0.05). There was no statistically significant difference in the color stability of the studie...

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“…However, they have several drawbacks: a) The final blue light output is less than 1% of the total energy input; b) QTH lamps have a limited lifespan because light filters degrade with time due to the high operating temperatures and proximity to the halogen bulb. (14)(15)(16) The LEDs system, opposed to QTH light, does not produce visible light through the heating of metal filaments, but through mechanical-quantical effects. (14) The spectral emittance of gallium nitride blue LEDs covers the absorption spectrum of camphorquinone, so that no filters are required in LED light curing units.…”

Section: Introductionmentioning

confidence: 99%

Color Stability of a Microhybrid Resin Composite Polymerized with LED and QTH Light Curing Units

Razavi

Esmaeili

Amiri³

et al. 2014

3dj

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Introduction: Discoloration of resin composites is a common reason for replacement of these restorations. The aim of this study was to evaluate the influence of different light curing devices on color stability of a microhybrid resin composite. Materials and Methods: 80 disc-shaped specimens (8 mm in diameter, 2-mm height) were fabricated from filtek Z250 resin composite. Specimens were divided into 4 groups (n=20) and cured with LED (Bluephase C5, Valo) or QTH (Astralis7 with two different light intensity) light curing devices. Baseline color of each specimen was measured with a spectrophotometer according to the CIE (L*a*b*) color scale. ( CIE L*a*b* is a color measurement system with dimension L for lightness and a and b for the color-opponent dimensions). Each subgroup (n=10) were immersed in tea or artificial saliva for 72h at 37°C. The color values of specimens were remeasured and the color change values (ΔE*ab) were calculated using One-Way ANOVA and Tukey test. A P value of <0.05 was considered significant. Results: In groups immersed in tea, specimens cured with high power mode of Astralis7 (750mW/cm2), showed the statistically significant lowest color change. There was no statistically significant difference between two types of Light Emitting Diode units. Conclusion: Conventional halogen light (QTH) with high power mode showed the maximum color stability in tea.

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Color stability of composites subjected to accelerated aging after curing using either a halogen or a light emitting diode source

Cited by 60 publications

References 18 publications

Color changes induced by light curing of resin composites

Color changes induced by light curing of resin composites

Effect of finishing and polishing on color stability of a nanofilled resin immersed in different media

Color Stability of a Microhybrid Resin Composite Polymerized with LED and QTH Light Curing Units

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