An application of nanotechnology in advanced dental materials

Mitra, Sumita B.; Wu, Dong Yang; Holmes, Brian N.

doi:10.14219/jada.archive.2003.0054

Cited by 792 publications

(718 citation statements)

References 5 publications

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“…These values can be as a result of their filler loading which ranges from 50 to 61% and the nano-sized filler particles. Nano-hybrid resin-based materials showed better mechanical properties when compared with the other materials [61,62]. These nano-hybrid materials showed a reduction of around 50% in 75% Ethanol/water and MEK after 90 days of storage except for TEC-BF that showed the least reduction in VHN among all the investigated materials after storage.…”

Section: Discussionmentioning

confidence: 89%

“…GA-F showed no significant difference in the DTS values in all storage media, indicating it resistance to solvent storage. These findings could be attributed to the nano-sized filler in addition to the silane treatment method that was described by the manufacturer as revolutionary in improving the material hydrolytic stability and durability [61,62].…”

Section: Discussionmentioning

confidence: 99%

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Surface and bulk properties of dental resin- composites after solvent storage

2016

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Surface and bulk properties of dental resin- composites after solvent storage

2016

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“…Flowable (low-viscosity) resin-composites have been reported with higher polymerization shrinkage as a result of reduced filler loading [13,27]. Nano-composites are a class of composite that was introduced for its improved mechanical properties, esthetic outcomes and reduced polymerization shrinkage [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

2016

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Shrinkage-strainShrinkage-stress Strain rate Modulus of elasticity Bulk-fill a b s t r a c tObjectives. To investigate a set of resin-composites and the effect of their composition on polymerization shrinkage strain and strain kinetics, shrinkage stress and the apparent elastic modulus.Methods. Eighteen commercially available resin-composites were investigated. Three specimens (n = 3) were made per material and light-cured with an LED unit (1200 mW/cm 2 ) for 20 s. The bonded-disk method was used to measure the shrinkage strain and Bioman shrinkage stress instrument was used to measure shrinkage stress. The shrinkage strain kinetics at 23 • C was monitored for 60 min. Maximum strain and stress was evaluated at 60 min. The shrinkage strain rate was calculated using numerical differentiation. Significance. The nature of the monomer system determines the amount of the bulk contraction that occurs during polymerization and the resultant stress. Higher values of shrinkage strain and stress were demonstrated by the investigated flowable materials. The bulk-fill materials showed comparable result when compared to the traditional resin-composites.

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“…Until recently there was no composite material capable of satisfying both the functional necessities of a posterior restoration and the aesthetic demands of the anterior restorative correction (Denehy, 2000;Mitra et al, 2003). In order to address this need micro-hybrid and nano-filled resins appeared in the market with properties of a high degree of initial and delayed polishment, similar to that obtained by micro-filled resins, as well as excellent mechanical properties, as good as those which are commonly obtained with the hybrid composite (Mitra et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…In order to address this need micro-hybrid and nano-filled resins appeared in the market with properties of a high degree of initial and delayed polishment, similar to that obtained by micro-filled resins, as well as excellent mechanical properties, as good as those which are commonly obtained with the hybrid composite (Mitra et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Color change using HSB color system of dental resin composites immersed in different common Amazon region beverages

et al. 2009

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The purpose of this study is to evaluate in vitro the color stability of composite resins when exposed to beverages with high coloring contents from the Amazon region. 240 samples from four different composite brands (Natural Look, Z350, 4Seasons and Opallis) of hue A3 were fabricated using an acrylic matrix. The samples were stored in distilled water at 37°C for 24 hours. The initial color (T0) was registered using a Canon EOS Rebel XTi 10 mp camera, and then the samples were divided into four groups (n=15): G1 (coffee), G2 (açaí juice), G3 (energetic guaraná) and G4 (control -distilled water). The samples were exposed to solutions of DES (6hs) and RE (18hs) and placed in a double boiler under constant agitation, at 37°C for 30 days. The samples were immersed in the coloring solutions for 15 minutes daily. After 7, 15 and 30 days, new photographic registers were made (T1, T2 and T3). The images were analyzed using Corel PHOTO-PAINT 12 software to identify the colors through the HSB system. The Kruskal-Wallis and t tests (p<0.05) demonstrated significant differences in color (hue, saturation and brightness). The results revealed that none of the tested composites showed color stability when exposed to coloring solutions, and that the Amazon region beverages (açaí juice and energetic guaraná) showed to be less coloring than coffee. KEYWORDS:Composite Resins, Coloring Agents, Color Perception Tests. Alteração de cor de resinas compostas imersas em diferentes bebidas comuns da região Amazônica, utilizando o sistema de cor HSB RESUMOEste estudo propôs avaliar in vitro a estabilidade de cor de alguns compósitos quando expostos a bebidas da Região Amazônica com alto teor de corante. Foram confeccionados 240 corpos de prova (CP) de quatro resinas (Natural Look, Z350, 4Seasons e Opallis) no matiz A3 utilizando uma matriz de acrílico. As amostras foram armazenadas em água deionizada a 37°C por 24 horas. A cor inicial das resinas (T0) foi registrada utilizando a máquina Canon EOS Rebel XTi 10Mp, e em seguida os CP foram divididos em 4 grupos (n=15): G1 (café), G2 (suco de açaí), G3 (guaraná energético) e G4 (controle -água destilada). Os CP foram submetidos às soluções DES (6hs) e RE (18hs) e colocados em banho-maria, sob constante agitação, à temperatura de 37°C durante 30 dias. Diariamente os corpos de prova foram imersos nas soluções corantes durante 15 minutos. Após 7, 15 e 30 dias realizaram-se novos registros fotográficos (T1, T2 e T3). As imagens foram analisadas pelo programa Corel PHOTO-PAINT 12 para a identificação das cores através do sistema HSB. O teste Kruskal-Wallis e teste t (p<0,05) demonstraram que a alteração de cor (matiz, saturação e brilho) indicou diferenças significantes. Foi concluído que nenhuma das resinas testadas apresentou estabilidade de cor quando em contato com as soluções corantes, e que as bebidas da região Amazônica (suco de açaí e guaraná energético) demonstraram ser menos colorantes que o café.

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An application of nanotechnology in advanced dental materials

Cited by 792 publications

References 5 publications

Surface and bulk properties of dental resin- composites after solvent storage

Surface and bulk properties of dental resin- composites after solvent storage

Polymerization shrinkage kinetics and shrinkage-stress in dental resin-composites

Color change using HSB color system of dental resin composites immersed in different common Amazon region beverages

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