Influence of viscosity and amine content on CC conversion and color stability of experimental composites

Camargo, Fernanda Missio; Bona, Álvaro Della; Moraes, Rafael R.; Souza, Carla Rodrigues; Schneider, Luís Felipe Jochims

doi:10.1016/j.dental.2015.01.009

Cited by 26 publications

(20 citation statements)

References 26 publications

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“…Reasons for these composite color changes can be broadly divided into endogenous and exogenous. Endogenous contributing factors include material aging, type of initiator systems, duration of polymerization, resin matrix composition, conversion of the matrix monomers, particle size and hardness, material polishability, and oxidation of the unreacted carbon double bonds . Exogenous sources comprise of dietary and smoking habits .…”

Section: Introductionmentioning

confidence: 99%

Effect of staining beverages on color and translucency of CAD/CAM composites

Quek

Yap

Rosa

et al. 2018

J Esthet Restor Dent

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Section: Introductionmentioning

confidence: 99%

Effect of staining beverages on color and translucency of CAD/CAM composites

Quek

Yap

Rosa

et al. 2018

J Esthet Restor Dent

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“…After 4, 6, and 12 months of storage, each specimen was washed in distilled water, air-dried, and measured again for color reassessment. The color change after each time point was calculated, as previously described 16 , using the following formula: …”

Section: Color Evaluation and Staining Of Specimensmentioning

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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“…The choice for these CQ/coinitiator molar ratios was that the first was the minimum CQ/BZN ratio that was comparable to CQ/DMAEMA, tested by the authors in a pilot study, which showed similar degree of conversion results. In addition, other study have demonstrated the same founds with the 0.2 CQ/DMAEMA molar ratio (7). Silanated barium borosilicate glass fillers were added to the organic phase (mean filler size: 0.7 µm -65 to 75 wt%, Esstech Inc., Essington, PA, USA) ( Table 1).…”

Section: Effect Of Bzn On An Experimental Compositementioning

confidence: 98%

“…It is well understood that factors such as type of photoinitiator (2), photoinitiator/coinitiator ratio (3,6,7), type and concentration of coinitiator (8) may influence the properties of the resin materials. These molecules must show high reactivity and high degree of monomer conversion, since no reactive monomers may diffuse out of the polymer matrix to the oral cavity (8).…”

Section: Introductionmentioning

confidence: 99%

Effect of the Bis-Dimethylamino Benzydrol Coinitiator on the Mechanical and Biological Properties of a Composite

et al. 2017

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To examine the effect of the alternative coinitiator 4,4'bis dimethylamino benzydrol (BZN) in degree of conversion (DC), mechanical and biological properties of experimental composites. The coinitiator BZN was used in three concentrations (0.2, 0.5 and 1.2%), and the coinitiator DMAEMA was used as control at the same concentrations as above. The molar concentration of camphorquinone (CQ) and coinitiators was kept constant (1:1). The composites were manipulated and submitted to microhardness test (VHN), flexural and compressive strength (in MPa), elastic modulus (GPa), DC (FT-IR) and in vitro cytotoxicity (against 3T3 fibroblastic cells) of the experimental resins. Data were subjected to two-way ANOVA and Tukey post-test (α=0.05). The experimental composite resin with BZN showed higher DC values compared to control DMAEMA groups. For the mechanical properties, microhardness values were higher in BZN groups; flexural strength and elastic modulus were similar between all the groups. Compressive strength for groups BZN0.5 and DMAEMA0.5 were not statistically different, being the lowest values attributed to group BZN0.2. The experimental resins with BZN and DMAEMA were considered nontoxic against 3T3 fibroblasts. The inclusion of the coinitiator BZN in experimental composites was considered nontoxic against 3T3 fibroblast cells, without compromising DC and mechanical properties.

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Influence of viscosity and amine content on CC conversion and color stability of experimental composites

Cited by 26 publications

References 26 publications

Effect of staining beverages on color and translucency of CAD/CAM composites

Effect of staining beverages on color and translucency of CAD/CAM composites

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

Effect of the Bis-Dimethylamino Benzydrol Coinitiator on the Mechanical and Biological Properties of a Composite

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