Ageing of silorane-based and methacrylate-based composite resins: Effects on translucency

Kaizer, Marina R.; Diesel, Pâmela Gutheil; Mallmann, André; Jacques, Letícia Borges

doi:10.1016/j.jdent.2012.04.014

Cited by 29 publications

(48 citation statements)

References 34 publications

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“…After placing the materials, the specimens were light-activated for 20 s at both the top and bottom surfaces using a light-emitting diode (LED) light-curing unit (Radii, SDI, Bayswater, Australia), which was continuously monitored to ensure that 900 mW/cm 2 of irradiance was applied to each specimen. Each group of specimens was then divided into two subgroups according to the surface finishing treatment applied (n = 7): no treatment (non-polished group) or finishing/polishing (polished group) using a complete sequence of Sof-Lex polishing discs (Pop On Orange series, 3M ESPE), from medium to extra-fine, 15 for 15 s each, followed by the application of felt discs (Diamond flex 12 mm, FGM, Joinville, Brazil) and diamond paste (Diamond AC II, FGM). The polishing procedure was performed by holding the specimen with tweezers.…”

Section: Methodology Study Design and Specimen Preparationmentioning

confidence: 99%

Effects of modeling liquid/resin and polishing on the color change of resin composite

et al. 2016

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Modeling liquids/resins have been used to build up resin composite (RC) restorations, although there is a lack of information regarding their effects on the color stability of the latter. Therefore, the purpose of the present study was to evaluate the effects of the presence of modeling liquid between layers of RC and the finishing/polishing state of the material on color change in specimens exposed to red wine staining over time. Specimens were prepared by placing four increments (±0.5 mm thick) of RC (Filtek™ Z350 XT, 3M ESPE) into molds; half of which were prepared by applying modeling liquid (Scotchbond™ Multi-Purpose™ Adhesive, SBMP, 3M ESPE) between the layers of RC, whereas the other half were prepared without SBMP (control). Light-activation was performed after application of the final RC layer using a light-emitting diode (Radii, SDI) curing unit with an irradiance of 900 mW/cm 2 for 20 s. Each group was divided according to the surface finishing protocol (n = 7): nothing (non-polished) or polishing with Sof-Lex™/diamond paste (polished). Initial colors of the specimens were evaluated with a digital spectrophotometer and the CIEL * a * b * color system. The specimens were stored in wine (37°C) for 12 months, and the color measurements were reassessed after 4, 6, and 12 months of storage. Scanning electron microscopy (SEM) analysis was performed at the end. Data were analyzed using ANOVA and Tukey's test (α = 5%). The presence of SBMP resulted in lower overall color change of the RC as compared with the control. The non-polished specimens exhibited a significantly higher color change than the polished specimens. SEM images corroborated the previous findings. In summary, the use of modeling liquid between layers of RC shows potential for application to reduce or delay the staining process of RC over time. Moreover, polishing is essential to provide increased color stability of the RC restoration.

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Section: Methodology Study Design and Specimen Preparationmentioning

confidence: 99%

Effects of modeling liquid/resin and polishing on the color change of resin composite

et al. 2016

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“…The translucency of composite materials before and after treatment is usually measured using the translucency parameter (TP) [22]. TP was obtained by calculating the color difference of the specimen over a black (B) and white background (W) according to the following formula:

TP = {[{({L_{W}}^{*} - {L_{B}}^{*})}^{2} + {({a_{W}}^{*} - {a_{B}}^{*})}^{2} + {({b_{W}}^{*} - {b_{B}}^{*})}^{2}]}^{1 ∕ 2}

If the material is absolutely opaque, the TP is zero.…”

Section: Methodsmentioning

confidence: 99%

Influence of biofilm formation on the optical properties of novel bioactive glass-containing composites

Hyun

Ferracane

2016

Dental Materials

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Objective Bioactive glass (BAG) has been suggested as a possible additive for dental restorative materials because of its antimicrobial effect and potential for promoting apatite formation in body fluids. The purpose of this study was to investigate the effects of bacterial biofilm on the change of colorimetric value and translucency of novel BAG-containing composites having different initial surface roughness. Methods Composites with 72 wt% total filler load were prepared by replacing 15% of the silanized Sr glass with BAG (65 mole% Si; 4% P; 31% Ca), BAG-F (61% Si; 31% Ca; 4% P; 3% F; 1% B), or silanized silica. Light-cured discs of 2-mm thickness (n=10/group) were divided into 4 different surface roughness subgroups produced by wet polishing with 600 and then up to 1200, 2400, or 4000 grit SiC. CIE L*a*b* were measured and the color difference and translucency parameter (TP) were calculated before and after incubating in media with or without a S. mutans (UA 159) biofilm for 2 wks (no agitation). Results were analyzed using ANOVA/Tukey's test (α = 0.05). Results All the color differences for BAG and BAG-F composite showed significant decreases with bacterial biofilm compared to media-only. The mean TP (SD) of BAG and BAG-F composite before aging [10.0 (2.8) and 8.5 (1.4)] was higher than that of the control composite [4.9 (0.8)], while the change in TP with aging was greater compared to the control with or without bacteria. BAG-F composites with the smoothest surfaces showed a greater decrease in TP under bacterial biofilm compared to the BAG composite. Significance Highly polished dental composites containing bioactive glass additives may become slightly rougher and show reduced translucency when exposed to bacterial biofilms, but do not discolor any more than control composites that do not contain the BAG.

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“…Resin composite's mimetism toward the surrounding tooth structure, as well as the stability of the esthetic result, are important clinical parameters for a long‐lasting esthetic restoration. However, it is well‐known that resin composite restorations present change in optical properties with time . The magnitude of the optical degradation is influenced by factors related to the material, and by various abrasive/erosive challenges related to the oral hygiene, as well as the composition of the diet.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bleaching Agents on Color and Translucency of Aged Resin Composites

Lago¹,

Mozzaquatro²,

Rodrigues

et al. 2016

J Esthet Restor Dent

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Ageing of silorane-based and methacrylate-based composite resins: Effects on translucency

Cited by 29 publications

References 34 publications

Effects of modeling liquid/resin and polishing on the color change of resin composite

Effects of modeling liquid/resin and polishing on the color change of resin composite

Influence of biofilm formation on the optical properties of novel bioactive glass-containing composites

Influence of Bleaching Agents on Color and Translucency of Aged Resin Composites

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