Oper Dent. 2017 Nov/Dec;42(6):E177-E187. doi: 10.2341/16-385-L. Epub 2017 Oct 4.
The present study determined the mechanical properties and volumetric polymerization shrinkage of different categories of resin composite. Three high viscosity bulk fill resin composites were tested: Tetric EvoCeram Bulk Fill (TB, Ivoclar Vivadent), Filtek Bulk Fill posterior restorative (FB, 3M ESPE), and Sonic Fill (SF, Kerr Corp). Two low-shrinkage resin composites, Kalore (KL, GC Corp) and Filtek LS Posterior (LS, 3M ESPE), were used. Three conventional resin composites, Herculite Ultra (HU, Kerr Corp), Estelite ∑ Quick (EQ, Tokuyama Dental), and Filtek Supreme Ultra (SU, 3M ESPE), were used as comparison materials. Following ISO Specification 4049, six specimens for each resin composite were used to determine flexural strength, elastic modulus, and resilience. Volumetric polymerization shrinkage was determined using a water-filled dilatometer. Data were evaluated using analysis of variance followed by Tukey's honestly significant difference test (α=0.05). The flexural strength of the resin composites ranged from 115.4 to 148.1 MPa, the elastic modulus ranged from 5.6 to 13.4 GPa, and the resilience ranged from 0.70 to 1.0 MJ/m. There were significant differences in flexural properties between the materials but no clear outliers. Volumetric changes as a function of time over a duration of 180 seconds depended on the type of resin composite. However, for all the resin composites, apart from LS, volumetric shrinkage began soon after the start of light irradiation, and a rapid decrease in volume during light irradiation followed by a slower decrease was observed. The low shrinkage resin composites KL and LS showed significantly lower volumetric shrinkage than the other tested materials at the measuring point of 180 seconds. In contrast, the three bulk fill resin composites showed higher volumetric change than the other resin composites. The findings from this study provide clinicians with valuable information regarding the mechanical properties and polymerization kinetics of these categories of current resin composite.
本研究旨在确定不同类别树脂复合材料的机械性能和体积聚合收缩率。测试了三种高粘度块状填充树脂复合材料：Tetric EvoCeram Bulk Fill（TB，Ivoclar Vivadent）、Filtek Bulk Fill 后牙修复材料（FB，3M ESPE）和 Sonic Fill（SF， Kerr Corp）。两种低收缩树脂复合材料，Kalore（KL，GC Corp）和 Filtek LS 后牙修复材料（LS，3M ESPE）也被用于测试。三种传统树脂复合材料，Herculite Ultra（HU，Kerr Corp）、Estelite∑Quick（EQ，Tokuyama Dental）和 Filtek Supreme Ultra（SU，3M ESPE）也被用作对照材料。根据 ISO 4049 规范，每种树脂复合材料使用 6 个样本，以确定弯曲强度、弹性模量和弹性。使用充满水的膨胀计测量体积聚合收缩率。使用方差分析和 Tukey 诚实显著差异检验（α=0.05）对数据进行评估。树脂复合材料的弯曲强度范围为 115.4 至 148.1 MPa，弹性模量范围为 5.6 至 13.4 GPa，弹性范围为 0.70 至 1.0 MJ/m。材料之间的弯曲性能存在显著差异，但没有明显的异常值。在 180 秒的时间内，体积随时间的变化取决于树脂复合材料的类型。然而，对于所有的树脂复合材料，除了 LS，体积收缩在光照射开始后很快就开始了，并且在光照射期间观察到体积迅速下降，然后缓慢下降。低收缩树脂复合材料 KL 和 LS 在 180 秒测量点显示出比其他测试材料显著更低的体积收缩率。相比之下，三种块状填充树脂复合材料显示出比其他树脂复合材料更高的体积变化率。本研究结果为临床医生提供了有关这些类别当前树脂复合材料的机械性能和聚合动力学的有价值信息。
