Influence of Photoinitiator System on Physical-Chemical Properties of Experimental Self-Adhesive Composites

Bértolo, M.; Moraes, Rita de Cássia Martins; Pfeifer, Carmem S.; Salgado, Vinícius Esteves; Correr, Ana Rosa Costa; Schneider, Luís Felipe Jochims

doi:10.1590/0103-6440201700841

Cited by 34 publications

(22 citation statements)

References 22 publications

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“…A higher concentration of the photoinitiators results in a greater color change of the material [44]. Residual yellow discoloration after UV polymerization is greater in RBCs containing BAPO than in those containing TPO [45]. As the polymerization rate of 3D printable materials is slow, their color stability may be influenced by these photoinitiators.…”

Section: Discussionmentioning

confidence: 99%

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

et al. 2021

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The purpose of this study was to examine and compare color and translucency stability of three-dimensional (3D) printable dental materials for crown and bridge restorations. Five different materials were investigated, and twelve disc-shaped specimens of two different thicknesses (1 and 2 mm) were prepared using a digital light processing 3D printer. Color measurements were made according to the CIELAB color scale (L*, a*, and b*) using a spectrophotometer 1 h, 1 day, 1 week, one month, and six months after post-curing of the materials, and the translucency parameter (TP) was calculated. The L*, a*, b*, and TP values were compared among the different materials and storage periods using repeated measures analysis of variance. Color and translucency changes of the specimens after the different storage periods were compared with 1 h measurements to determine whether they exceeded clinically perceivable thresholds. The L*, a*, b*, and TP values showed significant differences according to the storage periods, as well as among the materials. Until one month, some materials demonstrated distinct color differences, while others showed small color differences below a clinically perceivable threshold. The translucency differences were not clinically perceivable for any specimen. After six months, all specimens demonstrated large color changes, whereas the changes in translucency were relatively small. In conclusion, the color of 3D printable dental materials changed with time, and the differences varied with the materials used. On the contrary, the changes in translucency were small. Overall, the materials became darker, more yellowish, and more opaque after six months of water storage.

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Section: Discussionmentioning

confidence: 99%

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

et al. 2021

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“…The properties of adhesive systems are extremely important for the reliability and longevity of adhesive procedures. The chemical and physical properties of resin materials are directly related to their composition [45], since the monomer type may have some influence on the conversion and on the type of polymer that is formed, which may increase or decrease cross-link density [6].…”

Section: Introductionmentioning

confidence: 99%

The influence of nanofillers on the properties of ethanol-solvated and non-solvated dental adhesives

et al. 2019

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Objectives The aim of this study was to evaluate the influence of different concentrations of nanofillers on the chemical and physical properties of ethanol-solvated and non-solvated dental adhesives. Materials and Methods Eight experimental adhesives were prepared with different nanofiller concentrations (0, 1, 2, and 4 wt%) and 2 solvent concentrations (0% and 10% ethanol). Several properties of the experimental adhesives were evaluated, such as water sorption and solubility ( n = 5, 20 seconds light activation), real-time degree of conversion (DC; n = 3, 20 and 40 seconds light activation), and stability of cohesive strength at 6 months (CS; n = 20, 20 seconds light activation) using the microtensile test. A light-emitting diode (Bluephase 20i, Ivoclar Vivadent) with an average light emittance of 1,200 mW/cm 2 was used. Results The presence of solvent reduced the DC after 20 seconds of curing, but increased the final DC, water sorption, and solubility of the adhesives. Storage in water reduced the strength of the adhesives. The addition of 1 wt% and 2 wt% nanofillers increased the polymerization rate of the adhesives. Conclusions The presence of nanofillers and ethanol improved the final DC, although the DC of the solvated adhesives at 20 seconds was lower than that of the non-solvated adhesives. The presence of ethanol reduced the strength of the adhesives and increased their water sorption and solubility. However, nanofillers did not affect the water sorption and strength of the tested adhesives.

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“…EDMAB (ethyl 4-dimethylaminobenzoate), a tertiary amine which functions as a co-initiator of the polymerization reaction, is generally associated with camphorquinone to achieve a high degree of conversion. The unreacted camphorquinone during the polymerization process has a strong yellow coloration, which makes the resins that have it yellower than the others [30]. In this study, the coordinate b*, referring to the yellow color, presented significant bleaching for all composite resins evaluated, regardless of the presence of EDMAB in its composition.…”

Section: Discussionmentioning

confidence: 55%

The impact of at home and in-office bleaching agents on the color stability of bulk-fill composite resins

Araújo

Lemes

Pachito

et al. 2019

BDS

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Objective: This study compared different composites for color stability after exposure to at home and in-office bleaching gels. Material and Methods: Composite resin specimens (6mm diameterx2mm thickness) were manufactured according to the following groups (n=20): RC- Conventional; BF-Bulk Fill; RF-Flow; BFF-Bulk-Fill Flow. The surfaces were stained with coffee solution for 36hrs. A spectrophotometer was used to record the initial color (L*a*b*). Half of the specimens from each group underwent bleaching with 35% hydrogen peroxide (in-office) in three 45-minute applications. New color measurements were performed after 7, 14 and 21 days. The other half of the specimens underwent bleaching with 22% carbamide peroxide (at home) in 14 1-hour applications. Further color measurements were performed after 7 and 14 hours. For comparison between the color coordinates in different periods, ANOVA for repeated measures was applied (α=5%). The color variation (ΔE) was calculated for each group. Results: For in-office bleaching, there were no significant differences between the periods b* coordinate of the RF group, and for L* and b* coordinates of the BFF group. For at home bleaching the groups BF and BFF showed no differences for the L* coordinate. For the other coordinates, there was difference between the initial periods and after 14 days. The ΔE variation presented higher values for the at home bleaching groups. For both whiteners the bulk-fill resins presented the greatest color variations. Conclusions: Bulk Fill resins do not guarantee greater color stability than the other composite resins tested, including conventional flow resin. The conventional composite resin showed the lower ΔE.

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Influence of Photoinitiator System on Physical-Chemical Properties of Experimental Self-Adhesive Composites

Cited by 34 publications

References 22 publications

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

Color and Translucency Stability of Three-Dimensional Printable Dental Materials for Crown and Bridge Restorations

The influence of nanofillers on the properties of ethanol-solvated and non-solvated dental adhesives

The impact of at home and in-office bleaching agents on the color stability of bulk-fill composite resins

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