Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba 271-8587, Japan.
J Mech Behav Biomed Mater. 2011 Oct;4(7):1531-9. doi: 10.1016/j.jmbbm.2011.05.024. Epub 2011 May 19.
Dental resin composites are commonly used as restorative materials for dental treatment. To comprehend the static and dynamic moduli of dental resin composites, we investigated the mechanical behaviors of resin composites under static and dynamic loading conditions. Four commercially available resin composites for posterior restorations were evaluated. The percentages, by weight, of inorganic fillers of resin composites were examined by the ashing technique. The static compressive tests were undertaken with a constant loading speed of 1.0 mm/min using a computer-controlled INSTRON testing machine. The dynamic properties of composites were determined using the split Hopkinson pressure bar (SHPB) technique. When inorganic filler content was increased, a remarkable increase in the static modulus and dynamic modulus were observed. Furthermore, there was a strong relationship between the static modulus and dynamic modulus (r(2) = 0.947). The SHPB technique clearly demonstrated the dynamic properties of composites, and was a useful technique for determining the mechanical behavior of composites under dynamic compressive loading.
牙科树脂复合材料通常用作牙科治疗的修复材料。为了了解牙科树脂复合材料的静态和动态模量，我们研究了树脂复合材料在静态和动态加载条件下的力学行为。评估了四种市售的后牙修复用树脂复合材料。采用灰化技术检查树脂复合材料的无机填料的重量百分比。使用计算机控制的 INSTRON 试验机以 1.0mm/min 的恒定加载速度进行静态压缩测试。使用分离式 Hopkinson 压杆 (SHPB) 技术确定复合材料的动态性能。当无机填料含量增加时，观察到静态模量和动态模量的显著增加。此外，静态模量和动态模量之间存在很强的关系（r(2) = 0.947）。SHPB 技术清楚地显示了复合材料的动态性能，是一种用于确定复合材料在动态压缩载荷下的力学行为的有用技术。
