Effect of Photoinitiator Combinations on Hardness, Depth of Cure, and Color of Model Resin Composites

Salgado, Vinícius Esteves; Borba, Mila Metri; Cavalcante, Larissa Maria; Moraes, Rafael R.; Schneider, Luís Felipe Jochims

doi:10.1111/jerd.12146

Cited by 36 publications

(39 citation statements)

References 26 publications

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“…In this in situ staining challenge of resin‐based composites, the tested beverages differently affect the material's discoloration. The different color stability results may be related to the material's composition . Red wine and coffee induced the highest Δ E * for both IPS Empress Direct and Filtek Z350 XT, corroborating with findings from other studies .…”

Section: Discussionsupporting

confidence: 84%

“…The different color stability results may be related to the material's composition. 4,6 Red wine and coffee induced the highest DE* for both IPS Empress Direct and Filtek Z350…”

Section: Discussionmentioning

confidence: 99%

“…3 The intrinsic color change is attributed to chemical reactions such as hydrolysis of organic matrix and/or the matrix-filler interface, 4 leaching of unreacted monomers, 5 and photoinitiator components that were not consumed during light exposure. 6 The extrinsic color change is related to the absorption of pigments derived from solutions, regularly consumed beverages, such as coffee. 7 If staining gets through superficial layers, it does not get removed by polishing.…”

Section: Introductionmentioning

confidence: 99%

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In situ evaluation of color stability and hardness' decrease of resin‐based composites

Ribeiro

Peralta

Salgado

et al. 2017

J Esthet Restor Dent

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Section: Discussionsupporting

confidence: 84%

“…The different color stability results may be related to the material's composition. 4,6 Red wine and coffee induced the highest DE* for both IPS Empress Direct and Filtek Z350…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In situ evaluation of color stability and hardness' decrease of resin‐based composites

Ribeiro

Peralta

Salgado

et al. 2017

J Esthet Restor Dent

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“…On the other hand, in accordance with Schneider et al (5), the high concentration of the photoinitiator system may guarantee a high monomer conversion and consequently higher physical and mechanical properties of the composites. Therefore, the intense yellow hue of CQ places practical limits on the concentration of photoinitiators that can be used, because of the esthetic properties, but this may not limit the degree of polymerization and depth of cure that can be attained (9).…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Concentration and Ratio of a Photoinitiator System on the Properties of Experimental Resin Composites

et al. 2017

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The aim in this study was to evaluate the influence of different ratio of camphorquinone/ tertiary amine concentration on the flexural strength (FS), elastic modulus (EM), degree of conversion (DC), yellowing (YL), water sorption (WS) and water solubility (WSL) of experimental composites. Thus, acrylate blends were prepared with different camphorquinone (CQ) and amine (DABE) concentrations and ratios by weight: (CQ/DABE%): 0.4/0.4% (C1), 0.4/0.8% (C2), 0.6/0.6% (C3), 0.6/1.2% (C4), 0.8/0.8% (C5), 0.8/1.6% (C6), 1.0/1.0% (C7), 1.0/2.0% (C8), 1.5/1.5% (C9), 1.5/3.0% (C10). For the FS and EM, rectangular specimens (7x2x1 mm, n=10) were photo-activated by single-peak LED for 20 s and tested at Instron (0.5 mm/ min). Then, the same specimens were evaluated by FTIR for DC measurement. For YL, disks (5x2 mm, n=10) were prepared, light-cured for 20 s and evaluated in spectrophotometer using the b aspect of the CIEL*a*b* system. For WS and WSL, the volume of the samples was calculated (mm³). For WS and WSL, composites disks (5x0.5 mm, n=5) were prepared. After desiccation, the specimens were stored in distilled water for 7 days and again desiccated, in order to measure the WS and WSL. Data were submitted to one-way ANOVA and Tukey's test (5%). The groups C8, C9 and C10 showed higher DC, EM and YL means, compared to other composites. Therefore, the FS and WS values were similar among all groups. Also, C1, C2 and C3 presented higher WSL in 7 days, compared to other composites. In general, higher concentrations of camphorquinone promoted higher physical-mechanical properties; however, inducing higher yellowing effect for the experimental composites. Influence of Different Concentration a n d R a t i o o f a P h o t o i n i t i a t o r S y s t e m o n t h e P r o p e r t i e s o f Experimental Resin Composites

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“…22 The camphorquinone + TPO association also showed better color stability when compared to camphorquinone alone, after 30 days of storage in water. 23 Regarding other color parameters, ΔL and Δa had more stability than Δb, since the challenge used may have a greater affecton coordinate b, such as occurred with another study. 20 Furthermore, when comparing the resin composites, there were no differences in ΔL and similar differences found in Δa, regardless of the LUC used.…”

Section: Discussionmentioning

confidence: 80%

Influence of Light-curing Units on Surface Microhardness and Color Change of Composite Resins after Challenge

Souza¹,

Briso²,

Oliveira-Reis³

et al. 2019

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to evaluate microhardness and color change (ΔE) of composite resins, light cured with different light emission diodes (LEDs) and submitted to artificial accelerated aging (AAA). Materials and methods:Two composite resins with lucirin-TPO photoinitiator were selected: Tetric N-Ceram (Ivoclar Vivadent, A1) and Vit-l-escence (Ultradent, WO).A resin with the only camphorquinone photoinitiator was chosen as a negative control: Filtek Z350XT (3M ESPE, WD). Disc-shaped specimens were prepared (5 mm diameter; 1.5 mm thick) and photopolymerized with an LED with one wavelength (Radii-Cal, SDI) or multiple wavelengths (Valo, Ultradent), for each composite resin (n = 10). Surface microhardness and color evaluations were performed immediately after specimen preparation and after AAA. Microhardness results were analyzed using Kruskal-Wallis and Mann-Whitney tests for multiple comparisons. To compare the evaluation of microhardness at different times, the Wilcoxon test was used. Mean values of ΔE, ΔL, Δa, and Δb were evaluated using two-way analysis of variance (ANOVA), and Tukey test for multiple comparisons (α = 0.05). Results:Regarding microhardness, a statistically significant difference between the two LEDs was observed for Vit-lescence after AAA. When comparing composite resins that were light-cured with the same device, FiltekZ350XT obtained the greatest microhardness. All groups presented a statistically significant decrease in microhardness from the initial time to the AAA. Regarding ΔE, no statistically significant difference between the two LEDs was observed. When comparing composite resins, FiltekZ350XT showed the highest ΔE values. Conclusion:In general, an LED with multiple wavelengths influenced the microhardness of only one resin containing lucirin-TPO after AAA. The ΔE was more influenced by the composite resin than the LED device. Clinical significance:The knowledge of composite resin with deficiencies in the polymerization mechanism could contribute to preventing restorations to become more susceptible to color change and reduction of the mechanical strength.

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Effect of Photoinitiator Combinations on Hardness, Depth of Cure, and Color of Model Resin Composites

Abstract: The combination of alternative photoinitiators with the traditional camphorquinone/amine system improved the color stability of the model resin composites and maintaining their mechanical properties.

Cited by 36 publications

References 26 publications

In situ evaluation of color stability and hardness' decrease of resin‐based composites

In situ evaluation of color stability and hardness' decrease of resin‐based composites

Influence of Different Concentration and Ratio of a Photoinitiator System on the Properties of Experimental Resin Composites

Influence of Light-curing Units on Surface Microhardness and Color Change of Composite Resins after Challenge

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