Reduced Graphene Oxide-Zinc Oxide Flower-Like Composite for Glass-Ionomer Materials Reinforcement

Benevides, Ana Paula; Campos, Adriano Rocha; Vieira, Lanna Cristina Gonçalves da Costa; Perez, Cesar dos Reis; César, Deborah Vargas

doi:10.1590/1980-5373-mr-2019-0580

Cited by 11 publications

(5 citation statements)

References 56 publications

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“…Among these hybrid compounds, GO modified by ZnO is of particular interest since ZnO is tooth-colored and could inhibit S. mutans growth. ,− These GO-ZnO particles were successfully introduced into glass ionomer cements, and the resultant materials exhibited higher hardness than control . In addition, GO-ZnO/epoxy, − GO-ZnO/poly (methyl methacrylate), , and GO-ZnO/polydimethylsiloxane were constructed to improve the thermal stability, mechanical strength, corrosion resistance, and adsorption properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Nanorod-Decorated Graphene Oxide for Application in Dental Resin Composites

Wang

Chen

et al. 2023

ACS Biomater. Sci. Eng.

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Biofilm formation on resin composite surfaces is associated with the occurrence of secondary caries around restorations. As a promising antibacterial nanomaterial, graphene oxide is effective to suppress the viability of the cariogenic bacteria Streptococcus mutans (S. mutans). However, GO naturally expresses brown, which limits its potential application in dentistry. In this work, ZnO nanorod-decorated graphene oxide (GO n @ZnO) particles were synthesized via a facile hydrothermal method, and their optical property was regulated by changing the amount of seeded GO (n value) in the microemulsion. Among all hybrid particles, GO 3 @ZnO exhibited a bright gray color and lowest UV absorbance and therefore was selected as an optimal functional filler to produce dental composites with different loadings (0.1, 0.5, 1, and 3 wt %). The effects of GO 3 @ZnO loading on light transmittance, polymerization conversion, mechanical property, in vitro cell viability, and antibacterial effect of dental composites were systematically explored. The results exhibited that the 0.5 wt % GO 3 @ZnO-filled composite demonstrated comparable degree of conversion (60 s), higher flexural strength and modulus, and similar cell viability to the control. This composite also effectively inhibited the growth of S. mutans, giving a significantly lower bacterial concentration (3.9 × 10 7 CFU/mL) than the unfilled resin (8.5 × 10 7 CFU/mL) and the 0.5 wt % GO-filled composite (6.6 × 10 7 CFU/mL), respectively. The introduction of GO 3 @ZnO in dental composites could be a promising strategy to prevent secondary caries and extend service life.

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Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Nanorod-Decorated Graphene Oxide for Application in Dental Resin Composites

Wang

Chen

et al. 2023

ACS Biomater. Sci. Eng.

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“…Graphite oxide (GO) has received attention for its use as a source of graphene oxide by exfoliation techniques. Reduced graphene oxide has surface properties and a layered structure that makes it a versatile material for applications (Jiang et al, 2014;Sachdeva et al, 2020;Kigozi et al, 2020;Benevidesa et al, 2020;Fenfen et al, 2020;Wang et al, 2020;Faiz et al, 2020;Mizoguchi et al, 2020;Abbas et al, 2020;Naser et al, 2020;Newman et al, 2020). The physicochemical properties of GO can be modified and functionalized by tuning its oxide composition and crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Influencia de la temperatura en la energía de banda prohibida de nanoplaquetas de grafeno oxidado reducido según el modelo de Varshni

Prías-Barragán

2023

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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Se estimó la dependencia de la temperatura con la energía de banda prohibida (Eg(T)) en nanoplaquetas individuales de grafeno oxidado reducido (rGO) obtenidas de bambú. Las rGO se sintetizaron mediante el método de la doble descomposición térmica en un sistema de pirolisis, bajo una atmósfera de nitrógeno controlada y temperatura de carbonización fija en TCA = 973 K. Para la caracterización eléctrica de las rGO se empleó el método de curvas I-V en cuatro contactos eléctricos con nanocables de Pt depositados mediante el sistema de deposición inducida por haces enfocados de electrones e iones. La Eg(T) se estimó usando medidas de resistividad eléctrica tomadas a temperaturas que variaban entre los 30 y los 290 K. Las rGO exhibieron una Eg(T) descrita principalmente por el modelo de Mott de salto de rango variable tridimensional (VRH-3D). La Eg(T) se analizó considerando los modelos fenomenológicos de Varshni, Bose-Einstein, Magnoogian-Wooley, Viña, et al., y Päsler. Se encontró que el modelo de Varshni describía adecuadamente el comportamiento experimental de la Eg(T), con el valor de Eg(T = 0 K) extrapolado a 0,292 eV y los parámetros de Varshni de α = 6,70 x 10-4 eV/K y β = 33,62 K. Estos valores concuerdan con el orden de magnitud de los coeficientes de Varshni reportados para otros semiconductores de banda prohibida estrecha como el InAs y el InSb. Asimismo, se encontró que la presencia de puentes de hidroxilo en la rGO modificaba la longitud de los enlaces carbono-carbono, lo cual domina la respuesta eléctrica, como se preveía y ha sido reportado previamente al emplear cálculos de primeros principios vía la teoría del funcional de la densidad (DFT). Estos resultados sugieren que las rGO pueden ser excelentes materiales para el desarrollo de la electrónica avanzada de sensores y dispositivos.

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“…To improve the mechanical and physical properties of GICs, various materials such as metal powders, glass fibers, silica hydroxyapatite, and zirconia fillers have been used [10]. In recent years, attempts have been made to combine graphene-derived nanomaterials with commercially available GICs to strengthen them [11,12]. Graphene is a two-dimensional material arranged in a honeycomb lattice, which consists of crystalline sp 2 -carbon atoms [13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Nanographene Oxide on Microleakage of Conventional and Resin-Modified Glass Ionomer

Sharafeddin,

Ghodrati

2023

International Journal of Dentistry

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Objectives. One of the important features of the restorative materials is the ability to seal and prevent the microleakage. Glass ionomer cement (GIC) still exhibits some microleakage despite establishing a chemical bond to the tooth. The aim of this study was to evaluate the effect of nanographene oxide (nGO) on the microleakage of conventional (CGIC) and resin-modified glass ionomer cement (RMGIC). Methods. Thirty intact extracted molars were used. Class V cavities were prepared on their buccal and lingual surfaces. The samples randomly divided into two main groups of CGIC and RMGIC; each of them was randomly subdivided into three subgroups, including the group without nGO (control), the group with 1% nGO, and the group with 2% nGO. After restoring the cavities, they were subjected to thermocycling (1,000 cycles at 5/55°C). Two percent basic fuchsin solution was used to perform the microleakage test, and then the sectioned samples were examined by a stereomicroscope 40x. Kruskal–Wallis test, Dunn’s test, and Mann–Whitney U test were used to analyze the data ( P < 0.05 ). Results. Group CGIC + 1% nGO at the gingival margin and group RMGIC + 1% nGO at both gingival and occlusal margins had significantly less microleakage than their control groups ( P = 0.008 , P = 0.002 , P = 0.023 , respectively). Also, in these two groups, there were no significant differences between the microleakage of the occlusal and gingival margins ( P = 0.132 , P = 0.511 , respectively), while in all other groups, the gingival microleakage was significantly higher than that of occlusal microleakage. Conclusions. The addition of 1% nGO significantly reduced the gingival microleakage of CGIC and the occlusal and the gingival microleakage of RMGIC, while the addition of 2% nGO did not cause a significant reduction in microleakage.

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Reduced Graphene Oxide-Zinc Oxide Flower-Like Composite for Glass-Ionomer Materials Reinforcement

Cited by 11 publications

References 56 publications

Synthesis of ZnO Nanorod-Decorated Graphene Oxide for Application in Dental Resin Composites

Synthesis of ZnO Nanorod-Decorated Graphene Oxide for Application in Dental Resin Composites

Influencia de la temperatura en la energía de banda prohibida de nanoplaquetas de grafeno oxidado reducido según el modelo de Varshni

Evaluation of the Effect of Nanographene Oxide on Microleakage of Conventional and Resin-Modified Glass Ionomer

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