Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo.
Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo.
Dent Mater J. 2022 Feb 1;41(1):87-94. doi: 10.4012/dmj.2021-116. Epub 2021 Sep 2.
The purpose of this research was to investigate the mechanical behavior of commercially available bulk-fill and conventional flowable resin composites using the dynamic micro-indentation method. The effect of inorganic filler content on mechanical properties was also assessed. Weight percentages of the inorganic filler in the resin composite were measured using the ashing technique. The results showed that dynamic hardness and elastic modulus tended to increase with inorganic filler content. Furthermore, the differences in mechanical properties between top and bottom surfaces were less pronounced in bulk-fill flowable resin composites compared with conventional flowable resin composites. In conclusion, the mechanical properties of bulk-fill flowable resin composites are affected by filler content. Moreover, bulk-fill flowable resin composites have a higher polymerization depth than conventional flowable resin composites when sample thickness is 4 mm.
本研究旨在使用动态微压痕法研究市售的大颗粒填料通用型和传统流动性树脂复合材料的力学性能，并评估无机填料含量对其机械性能的影响。采用灰化技术测量树脂复合材料中无机填料的重量百分比。结果表明，动态硬度和弹性模量随无机填料含量的增加而增加。此外，与传统流动性树脂复合材料相比，大颗粒填料通用型流动性树脂复合材料的上下表面之间的机械性能差异较小。结论：大颗粒填料通用型流动性树脂复合材料的机械性能受填料含量的影响。此外，当样品厚度为 4 毫米时，大颗粒填料通用型流动性树脂复合材料的聚合深度高于传统流动性树脂复合材料。
