Hirayama Satoshi, Iwai Hirotoshi, Tanimoto Yasuhiro
Department of Operative Dentistry, School of Dentistry at Matsudo, Nihon University, Matsudo, Japan.
Department of Dental Biomaterials, School of Dentistry at Matsudo, Nihon University, Matsudo, Japan.
J Dent Biomech. 2014 May 2;5:1758736014533983. doi: 10.1177/1758736014533983. eCollection 2014.
Measurement of the strength of brittle materials, such as resin composites, is extremely difficult. Micro-indentation hardness testing is a convenient way of investigating the mechanical properties of a small volume of material. In this study, the mechanical properties of five commercially available flowable resin composites were investigated by the dynamic micro-indentation method. Additionally, the effects of inorganic-filler content on the dynamic hardness and elastic modulus of flowable composites obtained by this method were investigated. The weight percentages of the inorganic fillers in the resin composites were determined by the ashing technique. The results indicate that the mechanical properties of flowable composites are affected by not only the filler content but also the properties of the resin matrix. In conclusion, the dynamic micro-indentation method is a useful technique for determining the mechanical behavior of dental resin composites as brittle material.
测量脆性材料（如树脂复合材料）的强度极其困难。微压痕硬度测试是研究小体积材料力学性能的便捷方法。在本研究中，采用动态微压痕法研究了五种市售可流动树脂复合材料的力学性能。此外，还研究了无机填料含量对通过该方法获得的可流动复合材料的动态硬度和弹性模量的影响。通过灰化技术测定树脂复合材料中无机填料的重量百分比。结果表明，可流动复合材料的力学性能不仅受填料含量的影响，还受树脂基体性能的影响。总之，动态微压痕法是确定牙科树脂复合材料作为脆性材料力学行为的有用技术。
