LIU Yu-Ling;WANG Rui-Li;LI Nan;LIU Mei;ZHANG Qing-Hong
College of Materials Science and Engineering, Donghua University;College of Materials Science and Engineering, Donghua University;College of Materials Science and Engineering, Donghua University;Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University;College of Materials Science and Engineering, Donghua University
The inorganic filler is the main component of the dental restoration composite resin, which is very important for the properties and functions of composite resin. In this paper, zinc oxide (ZnO) mesocrystal microspheres were prepared from Zn(NO 3)·6H 2O solution in the presence of triethanolamine as the soft template by the hydrothermal method. These microspheres were self-assembled by 37.5 nm ZnO crystallite with good order. ZnO mesocrystal microspheres were modified with γ-methacryloxypropyltrimethoxysilane ( γ-MPS), subsequently mixed with modified SiO 2 microspheres as fillers, and then added to the Bis-GMA/TEGDMA system to prepare the composite resin. Through morphology observation and performance test, it is found that the filler is uniformly dispersed in composite resin. The one filled with 20 wt% ZnO mesocrystals has excellent mechanical properties and wear resistance. The flexural strength and modulus reach 133 MPa and 9.8 GPa, respectively with the volume loss at 1.02 mm 3 after 3 000 times of wearing, which is 88.7% and 90.8% lower than those of the composite resins filled with commercial ZnO microspheres and bare SiO 2, respectively. Moreover, the antibacterial rate of ZnO composite resin against Streptococcus mutans in the oral cavity reaches 99.9%.
dental composite resin;ZnO mesocrystal;mechanical property;wear resistance;antibacterial property
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