Oper Dent. 2020 Jan/Feb;45(1):41-51. doi: 10.2341/18-133-L. Epub 2019 Apr 29.
The objectives of the study were to compare the flexural modulus and strength of restorative and flowable bulk-fill resin-based composites (RBCs) to their conventional counterparts and to determine the effects of conditioning environment on their flexural properties. The materials evaluated included three conventional RBCs (Filtek Z350, Tetric N Ceram, and Beautifil II), three restorative bulk-fill RBCs (Filtek Bulk-Fill Restorative, Tetric N Ceram Bulk-Fill, and Beautifil Bulk-fill Restorative), as well as three flowable bulk-fill RBCs (Filtek Bulk-Fill Flowable, Tetric N Flow Bulk-Fill, and Beautifil Bulk-Fill Flowable). Specimens were fabricated using customized stainless-steel molds, finished, measured, and randomly divided into four groups. The various RBCs were conditioned in the following mediums (n=10) for seven days at 37°C: air, artificial saliva (SAGF), 0.02 N citric acid, and 50% ethanol-water solution. After conditioning, the specimens were rinsed, blotted dry, measured, and subjected to flexural testing using a universal testing machine. Data were subjected to statistical analysis using analysis of variance and the Tukey test at a significance level of = 0.05. Significant differences in flexural properties were observed between materials and conditioning mediums. Bulk-fill restorative RBCs exhibited higher flexural modulus than their bulk-fill flowable and conventional counterparts. With the exception of Filtek Bulk-Fill Flowable, bulk-fill flowable RBCs had significantly higher flexural strength than bulk-fill restorative and conventional RBCs. Flexural properties were highest when RBCs were conditioned in air and generally the lowest after exposure to ethanol.
本研究的目的是比较修复性和流动性块状填充树脂基复合材料（RBC）与传统 RBC 的弯曲模量和强度，并确定环境条件对其弯曲性能的影响。评估的材料包括三种传统 RBC（Filtek Z350、Tetric N Ceram 和 Beautifil II）、三种修复性块状填充 RBC（Filtek Bulk-Fill Restorative、Tetric N Ceram Bulk-Fill 和 Beautifil Bulk-fill Restorative）以及三种流动性块状填充 RBC（Filtek Bulk-Fill Flowable、Tetric N Flow Bulk-Fill 和 Beautifil Bulk-fill Flowable）。使用定制的不锈钢模具制作样本，完成后进行测量，并随机分为四组。将各种 RBC 在以下介质中于 37°C 下进行 7 天条件处理（n=10）：空气、人工唾液（SAGF）、0.02N 柠檬酸和 50%乙醇-水溶液。条件处理后，对样本进行冲洗、吸干、测量，并使用万能试验机进行弯曲测试。使用方差分析和 Tukey 检验对数据进行统计分析，显著性水平为 = 0.05。在材料和条件介质之间观察到弯曲性能的显著差异。块状填充修复 RBC 的弯曲模量高于其块状填充流动性 RBC 和传统 RBC。除了 Filtek Bulk-Fill Flowable 之外，块状填充流动性 RBC 的弯曲强度明显高于块状填充修复 RBC 和传统 RBC。当 RBC 在空气中条件处理时，弯曲性能最高，而在暴露于乙醇后，一般最低。
