Dynamic visco-elastic properties of dental composite resins

Mesquita, Renata V.; Axmann, Detlef; Geis‐Gerstorfer, Jürgen

doi:10.1016/j.dental.2005.04.019

Cited by 69 publications

(57 citation statements)

References 12 publications

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“…Consequently, it might become possible that the tooth structure would suffer from a catastrophic fracture or that the bond between tooth and restoration would be compromised, thus leading to marginal gap deformation, postoperative sensitivity and secondary caries. In the present study, it was found that ceramic inlays and onlays created lower stress levels in the tooth structures than composite resin inlay and onlays -and these findings were compatible with the results of Mesquita et al 18) . This was because the elastic modulus values of the composite resins were lower than enamel, which meant that they could not provide enamel with enough support.…”

Section: Discussionsupporting

confidence: 82%

“…Similarly, Pest et al 41) stated that restorative materials which were more rigid were more stress-resistant, but transferred a large part of the functional stress to the less rigid substrate (dentin) and hence elevated the risk of root fractures. In contrast to these findings, Mesquita et al 18) reported that if a composite had a low elastic modulus, it would deform more under functional stress. Consequently, it might become possible that the tooth structure would suffer from a catastrophic fracture or that the bond between tooth and restoration would be compromised, thus leading to marginal gap deformation, postoperative sensitivity and secondary caries.…”

Section: Discussionmentioning

confidence: 53%

“…If both were to be replaced, two distinct restorative materials should be used and as such, one of them should be chosen as a standard 7,[17][18][19] . Little information is available on the stress analysis of inlays and onlays made from porcelain and composite resins.…”

Section: Introductionmentioning

confidence: 99%

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Effects of different ceramic and composite materials on stress distribution in inlay and onlay cavities: 3-D finite element analysis

Yamanel

Çağlar

Gülşahı

et al. 2009

Dental Materials Journal

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To reduce loss of tooth tissue and to improve esthetic results, inlay and onlay restorations are good treatment choices for extensive cavities in posterior teeth. The aim of this paper was to evaluate, by means of three-dimensional finite element analysis, the effects of restorative material and cavity design on stress distribution in the tooth structures and restorative materials. Two different nanofilled composites and two different all-ceramic materials were used in this study. A permanent molar tooth was modeled with enamel and dentin structures. 3-D inlay and onlay cavity designs were created. Von Mises, compressive, and tensile stresses on the restorative materials, core materials, enamel, and dentin were evaluated separately. On the effect of restorative material, results showed that in the case of materials with low elastic moduli, more stress was transferred to the tooth structures. Therefore, compared to the nanofilled composites, the all-ceramic inlay and onlay materials tested transferred less stress to the tooth structures. On the effect of cavity design, the onlay design was more efficacious in protecting the tooth structures than the inlay design.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 53%

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Effects of different ceramic and composite materials on stress distribution in inlay and onlay cavities: 3-D finite element analysis

Yamanel

Çağlar

Gülşahı

et al. 2009

Dental Materials Journal

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“…5b are in contrast to those of Mesquita et al 23) , who observed significantly higher modulus for two direct composites (Diamond Lite and Grandio) versus two indirect ones (Artglass and Vita Zeta LC). However the different conclusion could be due to either the different composites selected or the different technique used (macroscopic dynamic mechanical analysis).…”

Section: Discussioncontrasting

confidence: 55%

Local viscoelastic response of direct and indirect dental restorative composites measured by AFM

Grattarola

Derchi²,

Diaspro

et al. 2018

Dent. Mater. J.

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We investigated the viscoelastic response of direct and indirect dental restorative composites by the novel technique of AM-FM atomic force microscopy. We selected four composites for direct restorations (Adonis, Optifil, EPH, CME) and three composites for indirect restorations (Gradia, Estenia, Signum). Scanning electron microscopy with micro-analysis was also used to support the results. The mean storage modulus of all composites was in the range of 10.2-15.2 GPa. EPH was the stiffest (p<0.05 vs. all other composites but Adonis and Estenia), while no significant difference was observed between direct and indirect group (p≥0.05). For the loss tangent, Gradia had the highest value (~0.3), different (p<0.05) from Optifil (~0.01) and EPH (~0.04) despite the large coefficient of variation (24%), and the direct composites showed higher loss tangent (p<0.01) than the indirect composites. All composites exhibited minor contrast at the edge of fillers, showing that these are pre-polymerized, as confirmed by EDS.

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“…Las propiedades viscoelásticas de los materiales compuestos pueden ser estudiadas por análisis térmico dinámico mecánico (DMA) 164 .El DMA es un equipo que estudia el comportamiento de un material cuando es sometido a una fuerza oscilante sinusoidal mientras se varía la temperatura. La deformación resultante (ε) también es sinusoidal y de la misma frecuencia, pero con un desfase, que se expresa como ángulo de fase δ.…”

Section: A) Introducción Teóricaunclassified

Estudio del comportamiento susceptor de microondas de nanotubos de carbono y grafeno multicapa para su aplicación en el calentamiento de polímeros.

Galiana¹

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RESUMENEl objetivo de la presente Tesis Doctoral consiste en el desarrollo de nanocompuestos de polipropileno (PP) capaces de ser calentados y procesados de manera efectiva mediante radiación microondas. Los polímeros apolares como el polipropileno son transparentes a la radiación microondas. Con el fin de aumentar la capacidad del polipropileno para absorber radiación microondas se emplearon dos tipos de nanopartículas carbonosas: nanotubos de carbono (NTC) y grafeno multicapa (GMC). Las nanopartículas se incorporaron en la matriz de polipropileno por mezclado en fundido en extrusora co-rotativa de doble husillo.La primera fase del experimental consistió en evaluar la influencia de las condiciones de procesado en la dispersión de las nanopartículas susceptoras en la matriz de polipropileno (PP). La dispersión fue evaluada en base a la morfología y propiedades reológicas de los nanocompuestos con un contenido del 1% en peso de NTC y GMC. De esta primera fase se seleccionaron las condiciones de procesado más adecuadas para los sistemas PP/GMC y PP/NTC, y que para ambos sistemas coincidieron en la incorporación de las nanopartículas mediante dilución de un masterbatch, el empleo de una configuración de husillo de alta cizalla y la aplicación de velocidades de extrusión altas (800 rpm).Los estudios llevados a cabo en los sistemas nanocompuestos PP/NTC y PP/GMC preparados en las condiciones seleccionadas mostraron un aumento de la rigidez mecánica y de la estabilidad térmica con el incremento del contenido de nanocarga. Se obtuvo un aumento del módulo de almacenamiento del 125% para ambos sistemas con un porcentaje de aditivación en peso del 1%.El GMC mostró un efecto lubricante semejante al grafito cuando se incorporó en bajos porcentajes. Las curvas reológicas mostraron una disminución de la viscosidad de los nanocompuestos con respecto al PP virgen.Del análisis de las propiedades eléctricas y dieléctricas se determinó que el límite de percolación eléctrica para los nanocompuestos de PP/NTC se encuentra alrededor del 1% de NTC, mientras que para los nanocompuestos PP/GMC este límite está alrededor del 10% de GMC (obteniendo un valor de 4 10 -6 S/cm). Todos los nanocompuestos de NTC mostraron un comportamiento semiconductor, con valores de conductividad volumétrica situados en un rango de [10 -1 -10 -6 ] S/cm según el contenido de NTC.Los nanocompuestos de NTC mostraron un aumento de la constante dieléctrica y del factor de pérdidas con el contenido de NTC. Por lo tanto, los nanocompuestos basados en NTC son capaces de absorber radiación microondas y transformar esta energía en calor. Sin embargo, las propiedades dieléctricas del GMC fueron muy bajas y apenas aumentaron con el contenido de GMC.Se estudió la influencia del grado de dispersión en la efectividad de calentamiento por microondas de los diferentes sistemas nanocompuestos desarrollados con 1% de GMC y NTC. Los nanocompuestos PP/GMC no reflejaron ningún comportamiento susceptor de radiación microondas con contenidos de GMC del 1% en peso. Sin embargo, los...

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Dynamic visco-elastic properties of dental composite resins

Cited by 69 publications

References 12 publications

Effects of different ceramic and composite materials on stress distribution in inlay and onlay cavities: 3-D finite element analysis

Effects of different ceramic and composite materials on stress distribution in inlay and onlay cavities: 3-D finite element analysis

Local viscoelastic response of direct and indirect dental restorative composites measured by AFM

Estudio del comportamiento susceptor de microondas de nanotubos de carbono y grafeno multicapa para su aplicación en el calentamiento de polímeros.

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