This study investigated the effect of food simulating liquids on visco-elastic properties of bulk-fill restoratives using dynamic mechanical analysis. One conventional composite (Filtek Z350 [FZ]), two bulk-fill composites (Filtek Bulk-fill [FB] and Tetric N Ceram [TN]) and a bulk-fill giomer (Beautifil-Bulk Restorative [BB]) were evaluated. Specimens (12 × 2 × 2mm) were fabricated using customized stainless steel molds. The specimens were light-cured, removed from their molds, finished, measured and randomly divided into six groups. The groups (n = 10) were conditioned in the following mediums for 7 days at 37°C: air (control), artificial saliva (SAGF), distilled water, 0.02N citric acid, heptane, 50% ethanol-water solution. Specimens were assessed using dynamic mechanical testing in flexural three-point bending mode and their respective mediums at 37°C and a frequency range of 0.1-10Hz. The distance between the supports were fixed at 10mm and an axial load of 5N was employed. Data for elastic modulus, viscous modulus and loss tangent were subjected to ANOVA/Tukey's tests at significance level p < 0.05. Significant differences in visco-elastic properties were observed between materials and mediums. Apart from bulk-fill giomer, elastic modulus was the highest after conditioning in heptane. No apparent trends were noted for viscous modulus. Generally, loss tangent was the highest after conditioning in ethanol. The effect of food-simulating liquids on the visco-elastic properties of bulk-fill composites was material and medium dependent.

译文

:这项研究使用动态力学分析研究了食品模拟液体对填充填充修复剂粘弹性的影响。评估了一种传统的复合材料(Filtek Z350 [FZ]),两种大块填充的复合材料(Filtek大块填充[FB]和Tetric N Ceram [TN])和大块填充giomer(Beautifil-大块修复剂[BB])。样品(12×2×2mm)是使用定制的不锈钢模具制造的。将样品光固化,从模具中取出,精加工,测量并随机分为六组。将各组(n = 10)在以下培养基中在37℃下调节7天:空气(对照),人工唾液(SAGF),蒸馏水,0.02N柠檬酸,庚烷,50%乙醇-水溶液。使用动态机械测试在弯曲三点弯曲模式下以及在37°C和0.1-10Hz的频率下对它们各自的介质进行评估。支撑之间的距离固定为10mm,轴向载荷为5N。弹性模量,粘滞模量和损耗角正切的数据在显着性水平p <0.05下进行了ANOVA / Tukey检验。在材料和介质之间观察到粘弹性的显着差异。除了块状填充的高聚物外,在庚烷中调理后的弹性模量最高。没有观察到粘弹性模量的明显趋势。通常,在乙醇中调理后,损耗角正切值最高。模拟食物的液体对填充复合材料的粘弹性的影响取决于材料和介质。

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