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A model of the viscoelastic behavior of flowable resin composites prior to setting

机译:凝固前可流动树脂复合材料的粘弹性行为模型

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Objective. The aim of this study is to develop fractional derivative models for the assessment of viscoelastic properties related to handling characteristics of dental resin composites belonging to two classes: flowable (Revolution Formula 2 and Filtek Ultimate) and posterior "bulk-fill" flowable base (Smart Dentin Replace). Methods. Rheological measurements on all materials tested in this study were performed using dynamic oscillatory rheometer at temperature of 23 ℃. A parallel plates module with a diameter of 20 mm was used to measure the properties of the resin composites tested. We developed two models to describe the obtained data: the generalized Newton model and the generalized Zener model (the so-called three parameter model). Both models contain fractional derivatives of Riemann-Liouville type. By determining the parameters of the model we were able to fit experimental data with high accuracy. Results. Our results show that flowable "bulk-fill" resin-composite material (SDR) has distinct properties as compared to other two flowable resin composite materials (Revolution Formula 2 and Filtek Ultimate). Thus, previously found SDR properties as "bulk-fill" flowable base results in the fact that it is described by generalized Zener model (i.e., it has properties of solid like viscoelastic material). Significance. Our model may be used to predict behavior of tested composites in different flow conditions. The SDR has initially small almost constant complex viscosity showing that it has good self-leveling property.
机译:目的。这项研究的目的是开发分数阶导数模型,以评估与牙科树脂复合材料的处理特性相关的粘弹性质,该类别属于两类:可流动的(Revolution Formula 2和Filtek Ultimate)和后部的“大量填充”可流动基料(Smart牙本质替换)。方法。使用动态振荡流变仪在23℃的温度下对本研究中测试的所有材料进行流变测量。使用直径为20mm的平行板模块来测量所测试的树脂复合材料的性能。我们开发了两个模型来描述获得的数据:广义牛顿模型和广义齐纳模型(所谓的三参数模型)。这两个模型都包含Riemann-Liouville型的分数导数。通过确定模型的参数,我们能够高精度地拟合实验数据。结果。我们的结果表明,与其他两种可流动树脂复合材料(Revolution Formula 2和Filtek Ultimate)相比,可流动的“本体填充”树脂复合材料(SDR)具有独特的性能。因此,先前发现的SDR特性作为“大量填充”的可流动基料导致这样的事实,即它由广义的Zener模型描述(即,它具有像粘弹性材料一样的固体特性)。意义。我们的模型可用于预测不同流动条件下测试复合材料的行为。 SDR最初具有几乎恒定的复数粘度,表明它具有良好的自流平性能。

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