Relationship Between the Degree of Conversion and Internal Discoloration of Light-activated Composite

Imazato, Satoshi; Tarumi, Hisashi; Kobayashi, Kyoko; Hiraguri, Hideki; Oda, Kin-ya; Tsuchitani, Y

doi:10.4012/dmj.14.23

Cited by 81 publications

(73 citation statements)

References 7 publications

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“…This water sorption is important because if the composite resin can absorb water, it is also capable of absorbing other fluids, such as coffee or tea, which would result in discoloration of the resin 8) . Imazato et al 31) studied the effect of degree of conversion on the internal discoloration of composites and concluded that the correlation of these two factors was significant. They found out that both the unreacted C=C and amines are linked with composite discoloration 19,20,22,29,30) .…”

Section: Discussionmentioning

confidence: 99%

Effect of different beverages on the color stability and degree of conversion of nano and microhybrid composites

et al. 2013

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This study sought to evaluate the effects of different staining solutions on the colour stability of nanocomposites compared with micro hybrid resin and to evaluate the degree of conversion of these two materials. Two different shades of two different composites were cured in polytetraflouroethylene disk rings. Coffee, tea and cola drinks were used as staining solutions, and distilled water was used as a control. Data were statistically analysed using a paired T-test with a significance level of 5%. Nano composite showed the highest degree of conversion (DC) values based on calculation of the bonded and free carbonyl peak intensities in the spectrum. The colour analysis showed that nanohybrid had the highest ΔE values when exposed to coffee solutions; they showed less color stability despite having a higher degree of conversion. Nano resin composite showed significantly higher discoloration than microhybrid composite.

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Section: Discussionmentioning

confidence: 99%

Effect of different beverages on the color stability and degree of conversion of nano and microhybrid composites

et al. 2013

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“…In other previous studies red wine was reported to produce the most severe discoloration in temporary resins, followed by coffee and tea 38,39) . In this study ΔE values were equal to or greater than 3.3 that considered to be clinically perceptible, based on previous reports 16,17) . After polishing, the ΔE values for black tea, coffee, and red wine decreased to below 3.3 ΔE and were therefore clinically acceptable, except for the manually polymerized composites GD, CM and the CAD/CAM composite HC.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, discoloration may occur over time when subjected to various media, such as coffee, tea, red wine, chlorhexidine or bleaching agents [13][14][15][16] . Color differences (ΔE) more than 3.3 units reflect clinically significant visual discoloration 17,18) . The degree of discoloration of resins can be influenced by a number of factors such as incomplete polymerization, water sorption, chemical reactivity, diet, oral hygiene or surface roughness of the restoration [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Discoloration of manually fabricated resins and industrially fabricated CAD/CAM blocks <I>versus</I> glass-ceramic: Effect of storage media, duration, and subsequent polishing

et al. 2012

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This study determined the discoloration of five CAD/CAM resins, four manually polymerized resins, and glass-ceramic as control group. Specimens were divided into three groups (N=300, n=30) to be stored in coffee, black tea and red wine (n=10). The discoloration was measured using a spectrophotometer after 1, 7, 29, 90, 180 days storage. All tested groups showed color change (ΔE) at all time points. The manually polymerized resin composites GD (Gradia) and CM (CronMix K), and the CAD/CAM resin composite HC (Blanc High-class) showed significantly higher ΔE compared to all other groups in all tested media. The discoloration was extrinsic and decreased after polishing for the majority of the tested materials. Except CAD/CAM resin HC (Blanc High-class), all CAD/CAM resins showed similar color stability compared to the control group.

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“…An inadequate composite resin polymerization is directly associated with color instability, which is due to easy dye and pigment diffusion through the resinous matrix (Imazato et al, 1995;Micali & Basting, 2004).…”

Section: Discussionmentioning

confidence: 99%

Color change using HSB color system of dental resin composites immersed in different common Amazon region beverages

et al. 2009

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The purpose of this study is to evaluate in vitro the color stability of composite resins when exposed to beverages with high coloring contents from the Amazon region. 240 samples from four different composite brands (Natural Look, Z350, 4Seasons and Opallis) of hue A3 were fabricated using an acrylic matrix. The samples were stored in distilled water at 37°C for 24 hours. The initial color (T0) was registered using a Canon EOS Rebel XTi 10 mp camera, and then the samples were divided into four groups (n=15): G1 (coffee), G2 (açaí juice), G3 (energetic guaraná) and G4 (control -distilled water). The samples were exposed to solutions of DES (6hs) and RE (18hs) and placed in a double boiler under constant agitation, at 37°C for 30 days. The samples were immersed in the coloring solutions for 15 minutes daily. After 7, 15 and 30 days, new photographic registers were made (T1, T2 and T3). The images were analyzed using Corel PHOTO-PAINT 12 software to identify the colors through the HSB system. The Kruskal-Wallis and t tests (p<0.05) demonstrated significant differences in color (hue, saturation and brightness). The results revealed that none of the tested composites showed color stability when exposed to coloring solutions, and that the Amazon region beverages (açaí juice and energetic guaraná) showed to be less coloring than coffee. KEYWORDS:Composite Resins, Coloring Agents, Color Perception Tests. Alteração de cor de resinas compostas imersas em diferentes bebidas comuns da região Amazônica, utilizando o sistema de cor HSB RESUMOEste estudo propôs avaliar in vitro a estabilidade de cor de alguns compósitos quando expostos a bebidas da Região Amazônica com alto teor de corante. Foram confeccionados 240 corpos de prova (CP) de quatro resinas (Natural Look, Z350, 4Seasons e Opallis) no matiz A3 utilizando uma matriz de acrílico. As amostras foram armazenadas em água deionizada a 37°C por 24 horas. A cor inicial das resinas (T0) foi registrada utilizando a máquina Canon EOS Rebel XTi 10Mp, e em seguida os CP foram divididos em 4 grupos (n=15): G1 (café), G2 (suco de açaí), G3 (guaraná energético) e G4 (controle -água destilada). Os CP foram submetidos às soluções DES (6hs) e RE (18hs) e colocados em banho-maria, sob constante agitação, à temperatura de 37°C durante 30 dias. Diariamente os corpos de prova foram imersos nas soluções corantes durante 15 minutos. Após 7, 15 e 30 dias realizaram-se novos registros fotográficos (T1, T2 e T3). As imagens foram analisadas pelo programa Corel PHOTO-PAINT 12 para a identificação das cores através do sistema HSB. O teste Kruskal-Wallis e teste t (p<0,05) demonstraram que a alteração de cor (matiz, saturação e brilho) indicou diferenças significantes. Foi concluído que nenhuma das resinas testadas apresentou estabilidade de cor quando em contato com as soluções corantes, e que as bebidas da região Amazônica (suco de açaí e guaraná energético) demonstraram ser menos colorantes que o café.

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Relationship Between the Degree of Conversion and Internal Discoloration of Light-activated Composite

Abstract: In order to elucidate the relationship between the degree of conversion and internal discoloration of lightfactors was significant for light-activated composite.

Cited by 81 publications

References 7 publications

Effect of different beverages on the color stability and degree of conversion of nano and microhybrid composites

Effect of different beverages on the color stability and degree of conversion of nano and microhybrid composites

Discoloration of manually fabricated resins and industrially fabricated CAD/CAM blocks <I>versus</I> glass-ceramic: Effect of storage media, duration, and subsequent polishing

Color change using HSB color system of dental resin composites immersed in different common Amazon region beverages

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