Division of Biomaterials, Department of Oral Functions, Kyushu Dental University, Kitakyushu-shi, Fukuoka 803-8580, Japan.
Division of Biomaterials, Department of Oral Functions, Kyushu Dental University, Kitakyushu-shi, Fukuoka 803-8580, Japan.
Dent Mater. 2019 Jun;35(6):893-899. doi: 10.1016/j.dental.2019.03.006. Epub 2019 Apr 5.
This study aims to prepare an organic-inorganic composite with a nanoscale dual-network structure composed of a ceramic skeleton and infiltrated resin to mimic the mechanical properties of human enamel.
A porous silica block was obtained by sintering a green body composed of SiO nanoparticles and poly(vinyl alcohol) organic binder. Methyl methacrylate monomers were infiltrated into the porous silica block and thermally polymerized to form poly(methyl methacrylate) (PMMA). A monolithic SiO-PMMA composite was obtained, and its nanoscale structure was investigated. Its mechanical properties were characterized by Vickers hardness, elastic modulus, and flexural strength tests.
The SiO-PMMA composite had a nanoscale dual-network structure composed of a silica-ceramic skeleton with PMMA-filled continuous 10-20 nm sized pores. The mechanical properties of the composite depended on the SiO content, which could be adjusted by modifying sintering time of the porous silica block. The mechanical properties of the composite exhibited wide variations with Vickers hardness values of 54-756, elastic moduli of 7-54 GPa, and flexural strengths of 75-120 MPa.
The preparation of a SiO-PMMA composite with a dual-network structure at the nanoscale was demonstrated, and the composite was characterized with respect to its hardness compatibility with human enamel.
本研究旨在制备一种具有纳米级双网络结构的有机-无机复合材料，该结构由陶瓷骨架和渗透树脂组成，以模拟人牙釉质的机械性能。
通过烧结由 SiO2 纳米颗粒和聚（聚乙烯醇）有机粘合剂组成的生坯，获得多孔二氧化硅块。将甲基丙烯酸甲酯单体渗透到多孔二氧化硅块中，并进行热聚合以形成聚甲基丙烯酸甲酯（PMMA）。得到了整体的 SiO-PMMA 复合材料，并对其纳米结构进行了研究。通过维氏硬度、弹性模量和弯曲强度测试对其力学性能进行了表征。
SiO-PMMA 复合材料具有纳米级双网络结构，由 PMMA 填充的连续 10-20nm 大小的孔的二氧化硅陶瓷骨架组成。复合材料的力学性能取决于 SiO2 的含量，通过调整多孔二氧化硅块的烧结时间可以进行调节。复合材料的力学性能变化范围很广，维氏硬度值为 54-756，弹性模量为 7-54GPa，弯曲强度为 75-120MPa。
证明了具有纳米级双网络结构的 SiO-PMMA 复合材料的制备，并对其硬度与人牙釉质的兼容性进行了表征。
